Moonrise, Moonset

July 1, 2014

We have previously studied the times of sunrise and sunset and the phases of the moon. Today we look at the times of moonrise and moonset.

The standard source for astronomical calculations is the Naval Observatory; they point to a 1989 article in Sky & Telescope for the calculation. The article isn’t online, but the code is: a horribly ugly BASIC program, reproduced on the next page.

Your task is to write a program that calculates the times of moonrise and moonset. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.


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