Why Do We Only See One Side of the Moon?

And if the band you’re in starts playing different tunes
I’ll see you on the dark side of the Moon.

One of my favorite readers, Zrinka, asks us why we’re only able to see one side of the Moon from Earth. Seriously, look at the different phases; we always see the same side of the Moon:

How does this happen? Well, the Moon makes one revolution around the Earth about every 29 days, and that’s what causes the Moon phases. But the Moon also rotates once every 29 days also. Because of this, the same side of the Moon always faces the Earth:

We call this “being locked.” We’re not the only system like this, by the way. Both of Mars’ moons, Phobos and Deimos, always have the same side facing Mars. All of Jupiter’s, Saturn’s, Uranus’, and Neptune’s moons are locked to those planets as well. And in a really weird case, Pluto and its largest moon, Charon, are locked to each other, so that both always show one another the same face:

But what made this happen? Why do Moons wind up locked to the planets they orbit? Like everything else in the solar system, the culprit is gravity. When you stand up, the Earth pulls down on you. But your feet are just a little bit closer to the center of the Earth than your head. This slight difference means that the Earth pulls with a slightly larger gravitational force on the lower half of you than the upper half; this slight difference is called a tidal force. When something like a Moon is close enough to a planet, these gravitational tidal forces cause the Moon to spin at the same rate that it revolves around the planet. When this happens, we call it tidal locking, and that’s why we always see the same side of the Moon!

This is true of all the planets’ moons that we know of, and is even true for some asteroids that are bound to each other. In fact, based on what we know, we think that an extra-solar planet, Gliese 581 c, is tidally locked to its Sun, just like our Moon is locked to us. Pretty neat!

Update: Here are a couple of images for you to compare. First up is the “near side” of the Moon, or the side that always faces us:

and next is the side you’ll never see from Earth, the “far side,” or the side always facing directly away from Earth:

These pictures were taken by the Clementine spacecraft, which was the first astronomical data I ever worked with as an undergraduate (back in 1998). Isn’t it neat how different these sides are? And now you know a little more about the side of the Moon you’ll never see!


  1. #1 Zrinka
    April 29, 2008

    Thank you Ethan, I am happy with your answer. I learned something new! The way you explain makes it easy to memorize the subject. In my primary and high school most of us students weren’t interested in Physics much, but now I know why. Because of the teachers, with no enthusiasm. This time readers like Matt won’t find details (btw. I would really like to be reader at that level and I hope I will reach it one day and enjoy in all important details), but for now I’m still learning basics and this kind of answer is enough for me. Ethan, you are definitely my favorite teacher!

  2. #2 ethan
    April 29, 2008

    We’re still learning about tidal locking, too. For instance, the Moon revolves one time for every one time it rotates, and so it’s locked to the Earth. The Earth rotates 365 times for every one time it revolves, and so it isn’t locked. But the planet Mercury rotates 3 times for every 2 times it revolves around the Sun. Why? Nobody knows! Also, if you haven’t been back in a while, check out the updated pictures of the near and far side of the Moon, above!

  3. #3 Brian
    April 29, 2008

    Ethan, that’s not true. We know why Mercury rotates 3 times for every 2 times it revolves. Mercury is trapped in a 3:2 spin-orbit resonance with the Sun, rather than the 1:1 synchronous state like the Moon is with the Earth. There are many other examples of interesting resonances in the solar system, especially due to Jupiter’s gravity. The textbook “Solar System Dynamics” by Murray and Dermott is a good, although technical, reference for this kind of stuff.

  4. #4 ethan
    April 29, 2008

    Yes, it’s in a 3:2 spin-orbit resonance. But giving it a name doesn’t explain how it got there. It’s very unusual, and we don’t know why it should have happened. The leading theory was that Mercury had a huge crater on its unimaged side; that theory is running out of room now that Messenger is photographing the parts that Mariner 10 missed.

    But nearly every celestial body that is in a tidal lock or resonance is in a 1:1 state. We lack the ability to predict what body will wind up in which resonance, and that’s why I say we don’t understand it.

  5. #5 Brian
    April 29, 2008

    It’s not that we don’t understand the dynamics. We do. The problem is not knowing the initial conditions, including events like large impacts. In fact, we can even make inferences about the initial conditions based on the fact that certain ‘odd’ resonances exists. You cited one such inference with the Mercury impact theory, which I don’t think is debunked at all since Mercury’s Caloris impactor could possibly serve as the culprit.

  6. #6 Gary
    April 29, 2008

    Why are the two sides of the moon so different in appearance?

  7. #7 ethan
    April 29, 2008

    Gary, that is a good question! It turns out that the far side of the Moon has more (and larger) craters on it than the near side, which is what you’d expect, since the near side has the Earth to shield a little bit of it. But the big differences in color that you see are what we call albedo, which is a special type of reflectivity. I’m not sure why the near side has a lower reflectivity than the far side on average; I think we just got lucky. Brian, do you know?

  8. #8 Brian
    April 29, 2008

    Gary/Ethan, the near side and far side look different because much of the near side has been resurfaced by mare basalts. These “lunar maria” are the dark areas that fill in the low-lying areas within large impact basins on the near side. 31.2% of the near side is covered by these volcanic deposits compared to only 2.5% on the far side. This is why the far side looks different; it hasn’t been covered by as much dark (low albedo) volcanic material. While you might initially think this difference could be due to the gravitational forces between the tidally locked Earth-Moon system or the varying crustal thickness of the Moon, both ideas aren’t the answer. The current best theory to explain the why the near side was more volcanically active than the far side is that more of the Moon’s heat-producing radioactive elements (known as “KREEP”) seem to be concentrated there. Why that is the case is anyone’s guess at this point.

  9. #9 Tamara
    April 29, 2008

    What’s the moon like below its surface, moving into the interior? And what’s the current thought on its formation? Was the study that came out in December that the moon is 30 million years younger and that the composition seems a lot more like Earth than previously thought, something that’s still in an early testing stage and unconfirmed? Or, has it has changed the way scientists are viewing the moon? If it’s the latter, then what types of questions has that raised for scientists?

  10. #10 ethan
    April 30, 2008

    Maybe the most interesting part of your question, Tamara, is asking where the Moon came from. That one is probably worth a whole extra post on its own. I’ll get working on it. 😉

  11. #11 Brian
    April 30, 2008

    Tamara, almost everything we know about the lunar subsurface comes from the Apollo Seismic Experiment. By analyzing data from moonquakes, lunar seismologists figured out what the interior of the Moon is like. The uppermost layer is called “regolith”, which is busted up rock and dust from all of the impacts on the lunar surface. Below that is the rest of the lunar crust followed by the mantle and core. We know from chemical analyses of lunar rock samples that the Moon is made up of pretty much the same stuff as the Earth. The main difference in composition is that the Moon is missing heavier elements like metals compared to the Earth. These are two of many strong pieces of evidence that the Moon and Earth formed from the same material (see upcoming post by Ethan). Another method that have proven useful for characterizing the lunar core is measuring the distance to the moon using laser reflectors left there by Apollo to determine the Moon’s “love number”, which relates to how much it deforms due to the pull of Earth’s gravity. That data told us that the Moon has a molten inner core. Since the Moon is so much smaller than the Earth, it cooled much more quickly, so the lunar mantle and core are much more solid compared to the Earth’s, though.

  12. #12 Brian
    April 30, 2008

    I’d like to add that several current and upcoming lunar missions include radar sounding experiments that will probe the upper few kilometers of the lunar subsurface to look for water or other useful materials, as well as characterize the layering of the lunar regolith and upper crust.

  13. #13 Anna K.
    April 30, 2008

    It is a sad thing to be so challenged at picturing motion . . . I can’t do contra dancing, which is a betrayal of my heritage, and I cannot figure out how the moon rotates.

    Does it do a furtive little circle on Day 29 when it is sure that no one is looking? Or does it slowly rotate somehow over 29 days but as everything is all moving in circles, we end up seeing the same side of the moon even though everything is moving?

    The whole thing makes me dizzy, and yet, I really appreciate this post.

    This is something I have wondered about for years; why the moon always looked the same.

  14. #14 Brian
    April 30, 2008

    Anna, think about the Earth and Moon like two gears spinning together. Maybe that’ll help you visualize how they could always show the same face to each other.

  15. #15 Anna K.
    April 30, 2008

    Hmmmmm. I’ll take your word for it, but still cannot picture how it would work without animation. I played around with some pot lids just now, but apparently spinning pot lids is not enough, since to me it still looks like one should eventually see all sides.

    It’s all in the timing, I suppose.

  16. #16 ethan
    April 30, 2008


    Try picturing it like this: stand up, take a pot lid and hold it at arms length with two hands, so that the inside of the pot lid is facing you and the outside is facing away. Then, using your feet, spin slowly in a circle. Notice how you always see the inside of the pot lid, never the outside. The Moon is locked to us in the same way. (You could do it with a beach ball if you have one, instead of a pot lid.)

    Now, have someone else hold the pot lid and move it around you the same way you moved it around yourself, but you spin around 29 times during the time it takes the lid to go around you once; now you’re spinning like the Earth, and the pot lid is facing you like the Moon! Hope that helps.


  17. #17 Anna K.
    April 30, 2008

    I am supposed to be finishing up the monthly household budget tonight, so naturally I was spinning slowly around the dining room with a pot lid. What didn’t make sense to me is why it was supposed to be rotating at the same time it was revolving, since the pot lid looked like it was only making one big circle to me, rather than two.

    So my husband and I just spent several minutes not budgeting, while he insisted that the pot lid was both rotating and revolving, and I said it looked like it was just revolving. Then he said, “Think of it from the perspective of the sun.” And of course, as it makes one revolution around the earth, it also rotates and shows all of its sides to the sun.

    So now, at last, I get it! (I hope!)

  18. #18 ethan
    April 30, 2008

    Anna, that’s right! You and your husband figured it out, and I’m glad I could help. Congratulations!

  19. #19 ethan
    April 30, 2008


    Your question is answered, hopefully to your satisfaction:



  20. #20 Tamara
    April 30, 2008

    Thank you Brian for such a comprehensive response. It really helped me visualize the composition of the interior, and understand why the lunar mantle and core are more solid. Plus it was interesting to read the information you gave about the current and upcoming lunar missions and the laser reflector measurements relating to the deformity of the Moon. I’m looking forward to your post expanding on this Ethan. It was a great original post and discussion to read 🙂

  21. #21 lena
    November 28, 2011

    Anna is so helpful.

  22. #22 Makoena
    May 21, 2012

    Thanks for a crystal clear and interesting explanation keep it up as we will also be learning from day to day from your site cheers!!

  23. #23 Jennifer Lawrence
    tooele utah
    September 20, 2012

    thanks for the answer and the help but im just wondering about the earths effect on the other planets?

  24. #24 Jennifer Lawrence
    September 20, 2012


  25. #25 Mike Porritt
    Melbourne Australia
    December 7, 2012

    After about 60 years of thinking it was amazing that the moon rotated and revolved at the same rate I finally looked it up and found your explanation. The explanation is cool but there seems to be a small bit missing .. it seems to me that the tidal locking would only occur if the moon was egg shaped(and I guess it probably is) or at least denser on the earth facing side.. if it were spherical and uniform i struggle to see why the difference in gravity frome core to surface would have any nett influence ? Have I missed a critical part of the explanation ?? Am I off the planet ?? 🙂

  26. #26 Cleon Teunissen
    December 8, 2012


    Yes, the tidal effect of the Earth’s gravitation on the Moon deforms it. In it’s current tidally locked state that deformation is static.

    Tidal effect deformation occurs anyway, both when tidally locked or not tidally locked. For example, besides the tides of the Earth’s oceans there is also a solid Earth tide. It’s very small, something like centimeters, but it’s not zero.

    Initially, when the Moon had formed, it probably rotated on its own axis faster than once per orbit. So back then the Earth’s tidal effect was “kneading” the Moon, like kneading dough.

    That kneading effect has consequences, and among them was that the Moon’s rotation rate was getting slower. Eventually the Moon reached a state of tidal lock. A that point the kneading stopped. The tidal deformation is still there, but there’s no kneading anymore as the the same side of the Moon keeps facing the Earth.

    From the onset of tidal lock on the Moon has remained in that rotation rate of once per orbit.

    Conversely, the Moon’s tidal effect (on the Earth’s oceans) is slowing down the Earth. Geologists look for sedimentation patterns. There is daily cycle, monthly cycle and yearly cycle in rate of deposition. Sometimes the layering is so well defined that ratio’s of these cycles can be determined. Combining data like that it has been inferred that something like 600 million years ago there were 400 days per year. That is, the days were shorter back then.

  27. #27 bhavika
    sirsa India
    January 21, 2013

    Thanks Ethan it helped me a lot but I read in a book that we can also see back side of the moon but now I came to know its not true thanks

  28. #28 Steve
    April 3, 2013

    No…this is wrong. If the moon did rotate we would see the other side. I did the pot lid excercise and I can see both sides. So, unless you have a clearer explanation, the moon does not rotate. And all one must do to verify it would be to follow it’s orbital path in a SR71 I suppose.

  29. #29 Wow
    April 4, 2013

    “No…this is wrong. If the moon did rotate we would see the other side.”

    No, if the moon did not rotate, then as it moves round us, what was the left side toward us and therefore visible becomes the left side away from us and therefore not visible.

    If I were to run around you but keep facing the same direction, you’d see all sides of me.

  30. #30 Steve
    April 4, 2013

    Well, if scientists fail to understand that the moon is facing us all the, time with a singleside as it orbits us cannot possibly be spinning, how are we supposed to believe them on anything else astrophysical

  31. #31 Wow
    April 4, 2013

    “Well, if scientists fail to understand that the moon is facing us all the, time”

    Since the moon doesn’t, the problem isn’t the scientists, is it.

    It’s you that is the problem.

  32. #32 Wow
    April 4, 2013

    Cut the wrong bit.

    ““Well, if scientists fail to understand that the moon is facing us all the, time… it … cannot possibly be spinning”

    Since the moon doesn’t, the problem isn’t the scientists, is it.

    It’s you that is the problem.”

    Because you suck at English, the sentence needed an emergency operation to make it well again.

  33. #33 Sean T
    April 4, 2013


    Do an experiment. Put a poster or something else on which you can focus on a wall in a room. Have someone stand in the middle of the room. Now, walk in a circle around that person, taking care to always be looking at the object you’ve placed on the wall. That ensures that you are not rotating your body as you walk around your partner. Now, ask your partner if he/she can see all sides of your body, or just your front as you walk around him/her. (Obviously your partner should keep turning so that he/she can always see you.)

    If you think hard about this, you’d realize that your partner can see all sides of you when you do as I’ve described. You would have to make one full rotation as you walk around in your “orbit” in order for your partner to only see your front side.

  34. #34 Sinisa Lazarek
    April 4, 2013

    What is most interesting to me is how the side facing us has much more darker regions (guessing these are cooled lava spots) then the opposite side. Any reason for this or just coincidence?

  35. #35 Wow
    April 4, 2013

    Asteroids tend to come from somewhere other than the earth.

    When battered by the huge number of asteroids ~4Bn years ago, this caused the marias we see all over the moon (and the earth, but that’s been surfaced with a green/blue carpet in more recent times).

    Since then, there’s been a much lower rate of impact and most that have been close enough to the moon’s face toward us to be seen have been deflected by us being nearby.

    The arse-end of the moon hasn’t had any such impediment to being cratered.

    And the small craters will make the maria bright and pockmarked.

  36. #36 Sinisa Lazarek
    April 4, 2013


    ahh.. so you’re saying the side facing us is darker because it’s been hit less and thus moon soil hasn’t covered them as much as on the side opposite of earth. Cool didn’t think of that 🙂

  37. #37 Sinisa Lazarek
    April 4, 2013

    I misinterpreted the darker areas as being hit more, which was odd since the earth is blocking the path. Thanx again

  38. #38 Wow
    April 4, 2013

    I seem to remember something about this on either Cosmos or Wonders of the Solar System.

  39. #39 CB
    April 4, 2013

    Can’t believe this got necroed just so someone could go “The moon doesn’t rotate, derp, therefore all of astronomy is wrong”.

  40. #40 Grahame
    November 22, 2013

    Mine s more of a question as to why we have not had a further exploratory manned landing on the moons other side?

  41. #41 It's like this...
    February 17, 2014
  42. #42 Walt McLauren
    Lexington, MO
    February 18, 2014

    I understand somewhat the comcept of a tidal force, but why wouldn’t all the planets be ‘locked’ to the sun? I keep thinking that each moon or any object in orbit probably has one side that has more mass than the other, due to ore deposits or the like, more density. Imagine the moon as if it were one of those toy clowns that you could not knock over. It would pop right back up because there was more weight in the bottom. Could the moons be ‘locked in’ by the simple fact that one side has more mass?

  43. #43 Michael Kelsey
    SLAC National Accelerator Laboratory
    February 18, 2014

    @Grahame #40: (Replying after seeing this resurrected post) I think the simplest answer to why none of the manned missions went to the Moon’s far side is communication: We would need to have at least two “selenosynchronous” satellites to use as communication relays for a farside mission. That doesn’t quite triple the cost, but it certainly more than doubles it.

  44. #44 Wow
    February 19, 2014

    Walt, the forces between the sun and planets are small and the shape change of the sun likewise small. Therefore the tidal bulge cannot produce a lot of torque to cause energy dissipation and cause any rotational lock.

    And there are many more objects to consider: each of the other planets.

    Unless their tidal bulge is synchronised, the asymmetry will be unsynchronised to any one planet and therefore cancel out.

  45. #45 farria
    February 24, 2014

    I love this website beacause my daughter uses it and it really helps her with her science!!!!!!:-)

  46. #46 Pradeep kumar
    Chennai India
    March 6, 2014

    Hi everyone,
    I have a very crazy question today, as I was wandering in my terrace around 5.30 pm and noticed moon right top in the sky and sun is about to set and the crescent moon was glowing as we all know moon reflects sun light and a question raised will the crescent moon will shine whole night ? Iam asking this question because at midnight the sun would have reached Mexico almost which the other side of the sphere as iam located in India, and now just imagine the position of sun earth and moon. Will earth disturb moon in getting light as it will be between both moon and sun (as we define new moon). Please explain this phenomenon.

  47. #47 Michael Kelsey
    SLAC National Accelerator Laboratory
    March 6, 2014

    @Pradeep Kumar #46: You ask a very good question, and it is a question which is equivalent to asking, “Why isn’t there a lunar eclipse at every new moon?”

    The answer, to your question and to this one, is “Because the Moon’s orbital plane is tilted with respect to the Earth’s orbital plane.” That is, if you draw a straight line from the Sun to and through the Earth, most of the time the Moon is actually above or below that line, even when it is on the side of the Earth away from the Sun.

    So even though from your perspective, standing on the surface, the Moon “should be blocked” from the Sun, in reality, light from the Sun zips right past the Earth out in space to hit the Moon.

  48. #48 Pradeep kumar
    March 6, 2014

    Thank you very much for your explanation, I have another similar question which i need to experiment first before asking, anyways much appreciated on your timely response.

  49. #49 PJ
    March 6, 2014

    Due to ‘libration’, we actually get to see a bit more than 50% of the lunar surface.

  50. #50 Pradeep kumar
    March 15, 2014

    What will happen if we drill a hole right through the centre of the earth and drop a ball into it? I would like to know precise will ball stop at a point or keep oscillating
    91 9884080116

  51. #51 Michael Kelsey
    SLAC National Accelerator Laboratory
    March 15, 2014

    @Pradeep Kumar #50: You might consider doing a Google search.

    Obviously, the hole is magical, and is unaffected by the temperature, pressure and composition of the rock it’s drilled through. Keeping that in mind…

    The simple answer is that the ball will hit the side wall of the hole very soon after you drop it, because of angular momentum conservation. If you make your hole perfectly aligned with the Earth’s axis of rotation, you can avoid this problem.

    Then, if the hole is filled with air, the ball will slow down, go through many oscillations (effectively, bounces) until it comes to rest at the center of the Earth. If the hole is evacuated, the ball can just go back and forth.

  52. #52 Pradeep
    Chennai india
    August 26, 2014

    Hi SLAC,
    I have a question I couldn’t even get good answer from google search, hope you may help me.
    Where do we get colours from?
    ie : I see loads of colours surrounded us in every single matter we use in our daily life for example a red water bottle, one May say it’s made of red plastic or fibre my question how did the plastic or fibre got the red pigment from is is naturally extracted or chemically compounded, please explain with a example.

  53. #53 Michael Kelsey
    SLAC National Accelerator Laboratory
    August 26, 2014

    @Pradeep #52: Please try the following Wikipedia article: https://en.wikipedia.org/wiki/Pigment . There are both natural and artificial pigments. Which one is used in any particular case depends on many things.

  54. #54 DJmike
    goo goo land
    December 4, 2014

    Thanks so much for the explanation it helped me in my science project,. by the way iam only eleven years old

  55. #55 Daniel
    January 29, 2015

    According to your model, if I am able to see the moon during the morning and throughout the day, does that then mean that those on the other side of the earth, are unable to view the moon throughout the night? How can I see the moon throughout the day and yet someone on the other side of the earth also be able to see the same moon at night??

  56. #56 Michael Kelsey
    SLAC National Accelerator Laboratory
    January 29, 2015

    @Daniel #55: Because when it is day time for you, and you see the Moon above you, it is *SIMULTANEOUSLY* night time on the opposite side of the Earth. The people over there, at night, would have to be able to look straight through the ground to see the Moon.

    In reality, of course (since the Earth isn’t transparent), those people over on the other side have to wait twelve hours or so. When the Earth rotates around so that _they_ are facing the Sun (i.e., daytime), then they too will see the Moon overhead during the day. It’ll then be night time for you, and you will have a lovely Moonless night in order to use your telescope.

  57. #57 usta
    February 4, 2015

    I feel really sorry for u people, the religion of science has u rejecting common sense for prescribed answers from nasa, I mean REALLY??? The moon does NOT rotate !! Why do people keep saying that???!!! When the moon orbits the earth we all agree that it always faces us, that is NOT rotation!! I read some moron saying, “think of two gears spinning” that is the dumbest thing ever! Two gears spinning would show all sides to each other, Think.. use your own brain…don’t let someone from nasa or anywhere else tell you 2+2=5

  58. #58 Pratheeksha
    February 17, 2015

    Very nice and interesting…….but I have a doubt. Before, the moon used to spin at a higher speed, compared to now. If that is soo, then what did the energy of the spin get converted into???

  59. #59 Wow
    February 17, 2015

    It’s converted into gravitational potential energy moving the earth and moon apart.

  60. #60 Pratheeksha
    February 20, 2015

    Oh….Thank you for clearing my doubt.

  61. #61 punit
    February 25, 2015

    Consider you are standing outside our galaxy(milky way) then how it will appears??Is it have a movements ??? Revolving??? Or what???????

  62. #62 Wow
    February 26, 2015

    The galaxy takes millions and millions of years to rotate once, so you won’t see any rotation in your lifetime, let alone in the small time of cognition of a movement occurring.

  63. #63 alice
    April 20, 2015

    not that much good

  64. #64 steveo
    June 12, 2015

    Just remember that the moon gets justs as much sunlight as the Earth only that it it is once every two weeks!

  65. #65 Abdulrahman
    Saudi Arabia
    August 7, 2015


    I am a mechniacal engineer and still cannot accept the standard statement given above of why the Far side of the moon is not seen on earth. If the above rotation theory is correct, then those at high altitude aircraft woulkd be able to see the hidden side of the moon, just as it has rotated away from an observer on earth but several radians away on the planets surface.

    I have a diferent explanation: The axis of the moons rotation about itself, is tilted to the earth”s axis. Therefore, as it rotates, an observer on earth will only see that part of the moon which is visible to an earth observer. The other “pole” of the moon cannot be seen by an earth observer. This to me is the true reason for a hidden side of the moon. Try holding an orange away from you, with its centerline angled away from you, then rotate it slowly, you will not be able to see its far side or hidden side because its rotational axis is tilted

    I hope a planetary astronomer can comment or correct me on this explanation..

  66. #66 ranko
    August 16, 2015

    I was looking at many nasa and other pictures around the world but could not get clear answer by them as they show sometimes mirror image of the moon.i understand the flaw of that but it shouldnt be posted as such. My question is shouldn’t moon picture taken on souh pole be upside down compared to picture taken on north pole and why we have pictures of the moon also tilted to the left and right? Also very disturbing thing to me is tysons explanation of shape of the earth, I was told in school that earth looks more like a shape of pear, looking by very few oics of earth I cannot really see true shape of the earth rest of images are CGI generared and all pics show perfect round sphere. To me obviously someone is lieing about something or maybe im missing something.

  67. #67 Wow
    August 16, 2015

    “I was told in school that earth looks more like a shape of pear”

    Well, that’s completely wrong. Either you weren’t told that or you were told that by some idiot who should never have been put teaching that class.

    The earth is an oblate spheroid (approximately) that is roughly the shape of a sphere that is fluid and spinning. But the difference between the minor axis (pole to pole) and major axis (across the equator) is a difference of 25 miles out of 7,926 and therefore less than 1%.

    Unless you measured real carefully, you would not notice the difference from circular cross section in a picture.

    You’re either lying or lied to and you missed any attempt at working out how to find out the actual size and shape of the earth.

  68. #68 Wow
    August 16, 2015

    “I hope a planetary astronomer can comment or correct me on this explanation..”

    I can give you a problem with your hypothesis an engineer should be able to understand: a solid body can only rotate around a single axis. Your hypothesis has two axises of rotation at least. And one of those axises moves none of the mass around the axis (else we would be able to see the “face” on the moon spin around 360 degrees).

    No need for planetary engineers, only basic mechanics.

  69. #69 ranko
    August 16, 2015

    Accusing me of lying is such lowblow , thinking that you’re some young punk , general explanation of shape of the earth is pear shape, like it or not. Neil degrasse tyson explained it same way recently, so he should be idiot also and banned from teaching? Some say he is greatest mind in astrophysics today.choose your words wisely before posting it.

  70. #70 PJ
    Perth, west Oz
    August 16, 2015

    He may well have been describing the shape of a ‘nashi’ pear, for all you know – not necessarily a bartlett pear ……

  71. #71 Wow
    August 17, 2015

    “Accusing me of lying is such lowblow ”

    Accusing me of a low blow is a low blow. I gave two reasons.

    Also note that the lie may have been that you do not remember what you WERE told and are ret-conning it. It is a well known phenomenon with witnesses: they are hugely unreliable.

    But “the shape of a pear” is so ridiculously wrong that it is a real possibility that you were lying or lied to.

    Just because you don’t like it doesn’t make it not be a fact.

  72. #72 Wow
    August 17, 2015

    “Neil degrasse tyson explained it same way recently”

    So you weren’t told in school. You heard it on the telly and NOT in school.

    So you lied.

  73. #73 Wow
    August 17, 2015

    PJ, according to wiki:

    “Pyrus pyrifolia, called Chinese Pear or Nashi pear, usually round, with brown or yellow skin”

    But schools DO NOT describe it as a pear. And Neil, if he used “pear” to describe the shape is more wrong than someone who uses “sphere” to do so. Even if he meant nashi pear, how many people would see one in the market and think it was a pear? Even then, if everyone he knows would have known it, why miss off “nashi”? And even if it was supposedly there, we now have that he said more than was quoted as being said, so what else was missed off?

    But still he isn’t a school teacher nor talking in school. And no school would describe it as pear shaped. Advanced geography may talk about the geode being a spheroid with 12 nodes, but they would be talking mathematically, not using an even less accurate foodstuff.

  74. #74 PJ
    Perth, west Oz
    August 17, 2015

    Absolutely right. The quote didn’t include the words ‘the earth is slightly larger south of the equator’.

  75. #75 Wow
    August 17, 2015

    So if his claim was this (as an example)

    The earth is often described as being a sphere like a ball, but it’s more like a peach in that it’s slightly larger south of the equator than it is north” then it would be acceptable, but quote mining it to “he said it was shaped like a peach” is disingenuous.

    It’s also not what they would explain in school with “it’s shaped like a peach”. AT MOST they would admit it’s not even an oblate sphere, slightly wider at the equator than it is from pole to pole, the shape is a little more complicated than that” but even that is at advanced geography level.

  76. #76 ranko
    August 17, 2015

    Wow , youre such full of yourself that I think your brains are made of your poop from your azz.im will not even bother to respond to your stupid last comment, youre really 1 arrogant SOB.

  77. #77 Wow
    August 18, 2015

    ranko, your wild accusation is merely sound and fury signifying nothing other than your desire to deflect away from the facts of the case because you have no defence of the accusations arising therefrom.

    Your failure to give your defence is proof of your guilt as charged.

    And liars deserve no respect and their claims deserve no recognition.

  78. #78 MoonIR
    Over There
    November 1, 2015

    The moon is my ass, Yes that bright ball in the sky is my shiny behind. My ass behaves badly at times and needs a spanking evey few billion years, hence the reasons behind my scars or dark spots as you call them. And don’t think I don’t see all you Perverts with your binoculars and telescopes checking my ass out. Where I’m from, objects would at least take one another on a date first before we engaged in such events. Anyway, Be sure to blow kisses next time you look up at my shiny behiny, I just might send a few unidentified flying objects back your way….Toodles!!

  79. #79 Wow
    November 2, 2015

    And it talks.

    Goodness, you spent a lot of time saying bugger all. Nothing better to do, hmm?

  80. #80 jamie
    November 30, 2015

    the moon according to my observation does not rotate on a vertical axis..it simply cartwheels left to right across the sky..

  81. #81 Wow
    November 30, 2015

    Cut out the heroin trips.

  82. #82 Stuart
    41 south 174 east
    April 10, 2016

    I’m rotating between the explanation on the reason the same moon face always same from earth. Before reading this, I had my own theory .. Which was at some stage in the moons development, it was smacked real hard by some very solid something, so much that it penetrated so deep that it offset the moons core – therefore the core of the moon is off centre, therefore the gravity of moon and earth, keep the same side facing us. Or that same object penetrated very close to the core, effectively having same result. 🙂 ? ?

  83. #83 Abit warrior
    August 26, 2016

    The moon is not a natural object infact its an alien space craft
    Broadcasting the fake 3D reality you call human life , the dark side is purposely positioned so that you cant see the alien infrastructures via telescope , the moon , sun and earth are all in mathematical proportion as evident in a solar eclipse when the moon passes in front of the sun to fit perfectly in proportion

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