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.
