All Questions
8
questions
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1
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What are the sources of error in the formula I derived to estimate sunrise and sunset times, and how can I improve its accuracy? [closed]
I derived the following formula to estimate sunrise and sunset times:
$$ t=\pm\cos^{-1}\frac{\sin\theta-\sin L_{loc}\sin L_{sun}}{\cos L_{loc}\cos L_{sun}} $$
$L_{loc}$ is the local latitude
$L_{sun}$...
- 101
21
votes
7
answers
5k
views
Finding how much time it takes for a complete Earth revolution around the Sun
Long story short, my brother made a joke about how stupid it is to celebrate the Earth making one "trip" around the Sun: New Year's Eve.
So I got curious and was wondering: how could the first ...
- 320
3
votes
2
answers
1k
views
Which will collide first, the moon and Earth, or Sun and Earth?
As time progresses, which scenario will happen first? The moon colliding with Earth, or the Earth colliding with the Sun? I figure the Moon and Earth will happen first, based on proximity, but the sun ...
- 31
2
votes
1
answer
230
views
Does the sun's bearing at a given time vary, and if so, how?
More an astronomy question, but Physics is the closest stack exchange category I could find and Google doesn't have the answer.
Granted, the sun's elevation changes for a given time of day throughout ...
- 123
3
votes
1
answer
3k
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Calculating the length of day at any time of the year? [duplicate]
Is it possible to calculate the length of the day at various location (distances) from the sun? I hear agricultural scientists are able to do that. To make calculations easier assume there is no axis ...
- 185
6
votes
1
answer
5k
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Finding radius of Earth through observation of Sun's motion
The question I'm about to pose is from a physics book I had recently bought. Since I am very interested in physics I am quite keen in understanding how this question can be solved. Before I present ...
- 383
5
votes
1
answer
385
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Why isn't sunset time in sync with solstice?
The winter solstice in the Northern Hemisphere in 2011 is on December 22.
But if I look at the sunset times for a location such as Washington, DC on the USNO site, the sunset time starts reversing ...
user921
7
votes
1
answer
4k
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Formula for getting time of sunrise at a particular location?
Is there a formula that can get sunrise at a particular latitude and longitude (and elevation from sea level)? If so, what is it and why does it work?
Moshe