1. The earth rotates and, as it rotates, the sun appears to rise and set.
2. The earth is tilted so as to not be perpendicular to the sun. Ergo, the sun rises and sets at a different time each day ... these times can be found in a set of Tables.
Quote:
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By JimRat: ...Arithematic to reduce the observations to LOPs is very complicated if one were to do them by hand, however the formulas have been greatly reduced, (i.e. simplified to basic math), by using Sight Reduction Tables....
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3. You can build your own set of Tables by making use of the following website:
http://aa.usno.navy.mil/data/docs/RS_OneYear.php
4. The primary reference point for sunrise and sunset is Greenwich, England. All times found in the Tables should be referenced to Greenwich time ... also known as “GMT” or “Zulu” time (e.g. “1525 Z” denotes 3:25 pm Zulu time).
5. In
Silent Hunter IV, the motions of neither the sun nor the moon correspond to the real life Tables. So far, I've observed errors of more than 30 minutes between computed sunrise and in-game sunrise.
Note: Thankfully, the phases of the moon are fairly accurate.
6. If anyone can direct me to a set of Tables that corresponds to when the sun and moon rise and set in the game, I’d be most appreciative.