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« One thing we can all agree on | Main | The Greatest Story Ever Told -- 07 -- Save the neutrons! »

Weekend Diversion: A little Sun for everyone

Category: Random Stuff
Posted on: March 21, 2010 12:50 PM, by Ethan Siegel

Beauty is a form of genius - is higher, indeed, than genius, as it needs no explanation. It is of the great facts in the world like sunlight, or springtime, or the reflection in dark water of that silver shell we call the moon. -Oscar Wilde
Yesterday was the spring equinox for the Northern Hemisphere, and my city was lucky enough to have a glorious day, clear skies, warm weather, and I spent most of the day outside. I had the type of day that Dan Tyminski pines for in this song, Some Early Morning.

But yesterday -- the equinox -- was special for another reason that you don't often hear about. You see, the Earth rotates on its axis, tilted at a fairly severe 23.5 degrees.

equinox.jpg

During the months April through August, the northern hemisphere gets long days and lots of sunlight, while the South Pole gets nothing but freezing darkness. On the other hand, from October through February, the southern hemisphere gets the long days, while the North Pole never sees the Sun.

But our equinoxes -- and we only get two per year -- are very, very special. The Sun illuminates all parts of the Earth equally on these days.

Earth-lighting-equinox_EN1.png

These are the only days of the year where everywhere on Earth has a chance at Sunlight. Moreover, on the equinoxes, everybody gets twelve hours of Sun (well, they would if the skies were clear) and twelve hours of night. Everyone. North Pole, South Pole, Equator, and everywhere in between. Starting today and all the days after for the next six months, someone at the South Pole will never see the Sun. Just like for the prior six months, Santa Claus (and everyone else at the North Pole) never saw the Sun.

Santa_North_Pole.png

The spring equinox was not only our switch, it was one of two days a year where everyone got the same amount of daylight. That's even where the word equinox comes from: equi = equal + nox = night. So I hope you enjoyed it, and to those of you in the northern hemisphere with me, we've got six months where things should only get better!

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Comments

1

Congrats! You've been Mabussed.

Just listened to the 365 Days of Astronomy for the 20th going over the same deal.

Posted by: Sili | March 21, 2010 2:23 PM

2

And yesterday was also our new year because of the exact same reason!

Posted by: Lotharloo | March 21, 2010 2:23 PM

3

Surely you mean 3 months where things should only get better? After the summer solstice the days get shorter and that, to me, is definitely things getting worse. It's after the winter solstice that things get better for 6 months.

Posted by: Julian Smith | March 21, 2010 3:39 PM

4

The poles get 24 hours with the sun on the horizon.

Posted by: Alistair Wall | March 21, 2010 10:21 PM

5

It is the intelligence behind all the rules of the nature which attract my attention and invite me to think about.

Posted by: mansour daftarian | March 26, 2010 2:24 AM

6

This means at certain times of the year, the Northern Hemisphere is more directly facing the Sun, while 6 months later when the Earth is on the other side of the Sun, the Southern Hemisphere is more directly facing the Sun.
Annuities

Posted by: Benjamin Bratt | April 30, 2010 2:09 AM

7

Beauty is a form of genius - is higher, indeed, than genius, as it needs no explanation. It is of the great facts in the world like sunlight, or springtime, or the reflection in dark water of that silver shell we call the moon.

Posted by: free business cards | June 21, 2010 10:08 AM

8

This means at certain times of the year, the Northern Hemisphere is more directly facing the Sun, while 6 months later when the Earth is on the other side of the Sun, the Southern Hemisphere is more directly facing the Sun.

Posted by: Kaizen | July 8, 2010 1:11 PM

9

Starting today and all the days after for the next six months, someone at the South Pole will never see the Sun.

Posted by: Document Scanning | July 11, 2010 10:11 AM

10

The comments are sure to please those outside Washington who see lobbyists as the source of Washington's problems and sure to raise the hackles of Washington's approximately 14,000 lobbyists.

Posted by: Pet Urns | July 23, 2010 11:30 AM

11

Beauty is a form of genius - is higher, indeed, than genius, as it needs no explanation. It is of the great facts in the world like sunlight, or springtime, or the reflection in dark water of that silver shell we call the moon.

Posted by: Keratin Complex By Coppola | August 6, 2010 1:01 PM

12

This means at certain times of the year, the Northern Hemisphere is more directly facing the Sun

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Posted by: jim | August 31, 2010 12:30 PM

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I love summer and the sun wish it lasted a little longer in this area before i know it we are back to the dark days!

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19

This site is for the birds! I post, then never see my comment or it takes 10 minutes for it to appear

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22

I love science. So many young people don't even know what an Equinox is. Thanks for the post.

Posted by: Georgette Pauls | October 10, 2010 3:51 PM

23

Starting today and all the days after for the next six months, someone at the South Pole will never see the Sun.

Posted by: cara memperbesar | October 27, 2010 4:36 AM

24

This site is for the birds! I post, then never see my comment or it takes 10 minutes for it to appear

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25

One such is Daniel Crandall who has taken exception to a piece that I wrote about Avatar for the forthcoming number of the New Atlantis and that has already burun estetiği been posted on the magazine

Posted by: burun | October 28, 2010 9:09 AM

26

I work outdoors and i love the summertime because i can work until 9pm and the sun is still shining. During the winter time, the flashlights come out at 4pm. Major bummer.

Posted by: Jason | November 11, 2010 10:14 PM

27

Don't think I could handle such extreme time changes like that Jason. Can barely handle daylight savings in the winter with the sun setting sooo early.

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This means at certain times of the year, the Northern Hemisphere is more directly facing the Sun, while 6 months later when the Earth is on the other side of the Sun, the Southern Hemisphere is more directly facing the Sun. Annuities

Posted by: Annuities | December 2, 2010 12:04 AM

32

Of course, there is nothing to forbid the old and the shriveled from joining in, but the sight of their doing filme onlineso is an embarrassment, all the greater when they themselves seem unaware of this.

Posted by: cartus | December 29, 2010 7:59 AM

33

I almost forget everything about geography since I left middle school...LOL. Anyway, thanks for putting this up, really learn something from it.

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34

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35

This means at certain times of the year, the Northern Hemisphere is more directly facing the Sun, while 6 months later when the Earth is on the other side of the Sun, the Southern Hemisphere is more directly facing the Sun.

Posted by: flash games | January 28, 2011 6:22 PM

36

Beauty is a form of genius - is higher, indeed, than genius, as it needs no explanation. It is of the great facts in the world like sunlight, or springtime, or the reflection in dark water of that silver shell we call the moon. It is the intelligence behind all the rules of the nature which attract my attention and invite me to think about.

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37

Our whole world is incredibly beautiful!
The corporations should stop to destroy it through their behaviour!

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39

What I find odd is that during winter, Earth is closer to the sun than during summer. It's the affect of the axis tilt that causes more sunlight to hit the Earth in the summer that counts. Annuities

Posted by: Johnny | March 24, 2011 7:08 PM

40

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41

I particulary appreciated the Oscar Wilde quote. It's a very good one. Beauty doesn't need explanation. What wonderful words.

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