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1bc61f714e
Added sunrise/sunset test data for locations at or near the poles. This causes rise/set tests to fail. I need to fix these cases! Observations: 1. Sunrise/sunset at the poles has nothing to do with the Earth's rotation. It is based only on the Sun's declination. Therefore, it makes no sense to look at hour angles there. 2. At the poles, there is no such thing as a meridian. For example, at the north pole, no matter which way you turn, you are facing south! So the very notion of hour angles is meaningless. 3. At the poles, there is a single sunrise and a single sunset per calendar year. The sun rises near the spring solstice for that hemisphere, and sets near the autumn solstice. 4. Near the poles, sunrise/sunset behavior gets more complicated. It is possible for there to be more than one sunset or sunrise per 24-hour period, because of changes of Sun declination.
48 lines
5.7 KiB
HTML
48 lines
5.7 KiB
HTML
https://aa.usno.navy.mil/calculated/rstt/year?ID=AA&year=2022&task=0&lat=89&lon=30&label=Almost+North+Pole&tz=0.00&tz_sign=-1&submit=Get+Data
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o , o , ALMOST NORTH POLE Astronomical Applications Dept.
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Location: E030 00, N89 00 Rise and Set for the Sun for 2022 U. S. Naval Observatory
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Washington, DC 20392-5420
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Universal Time
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(**** object continuously above horizon) (---- object continuously below horizon)
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Add one hour for daylight time, if and when in use.
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