Comments and questions about the
APOD on the main view screen.
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rigelan
- Science Officer
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by rigelan » Sun Dec 23, 2007 12:20 am
What do you mean points?
Lattitude & Longitude?
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Qev
- Ontological Cartographer
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by Qev » Sun Dec 23, 2007 12:48 am
Wouldn't that be the Tropics?
Don't just stand there, get that other dog!
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starnut
- Science Officer
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by starnut » Sun Dec 23, 2007 2:19 am
Qev wrote:Wouldn't that be the Tropics?
Yes, at the Tropic of Cancer during the northern summer solistice and the Tropic of Capricorn during the southern summer solistice.
Fight ignorance!
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rigelan
- Science Officer
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by rigelan » Sun Dec 23, 2007 5:45 pm
And somewhere in between at somewhen inbetween
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auroradude
- Ensign
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Contact:
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by auroradude » Mon Dec 24, 2007 12:34 am
And everywhere on the equinoxes.
Of course, this is all theoretical since in actuality the length of a day will also depend on atmospheric refraction, the horizon and the altitude of an observer.
Next stop... the twilight zone...
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rigelan
- Science Officer
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- Location: Indianola, IA
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by rigelan » Mon Dec 24, 2007 1:17 am
Hah! Sure. Does the equal day refer to the time between the peeking of the sun over the horizon or from the full sun appearing? And besides, I'm not so sure I get a full 180 degree view of the horizon here in the rolling hills of Iowa
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BMAONE23
- Commentator Model 1.23
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by BMAONE23 » Mon Dec 24, 2007 5:42 am
starnut wrote:Qev wrote:Wouldn't that be the Tropics?
Yes, at the Tropic of Cancer during the northern summer solistice and the Tropic of Capricorn during the southern summer solistice.
I was under the impression thet the Solstices were the days of Most daylight time (summer) & least daylight time (winter). At the Northern Summer Solstice, (JUNE 21st or so) the Sun is shining directly on the Tropic of Cancer but the length of day is still slightly longer than night at the tropic. The time of equal day and night still occur at the Equator, it just gets less Direct Sunlight. Same for the Northern Winter Solstice when the sun is shining directly on the Tropic of Capricorn. This is the time of the longest Southern hemisphere day. But it is also with Equal day/night hours at the Equator
notice where the equitorial line meets the terminator in this image
![Image](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Earth-lighting-summer-solstice_EN.png/800px-Earth-lighting-summer-solstice_EN.png)