Compute the times of Rise and Set of a Star

This is a first-order implementation of the times of Rise and Set of a Star. I do not consider the eccentricity of the orbit of the Earth or any irregularity of Earth's rotation.

The advantage is that, by using a Tropic Calendar and Tropic Coordinates, these formulas can be applied to any year or even to fictional planets...

Notice that the Longitude of the Observer does not enter the computation, since the output is given in local hours.

I hope (*) the error in this page is less than 30 minutes.

Month Day use month and day
Fraction of the Year since March Equinox use fraction of the year
 
Latitude of Observer degrees (+ N) Obliquity of the Ecliptic degrees use the Sun
Right Ascension of Star hours Declination of Star degrees use star
Rise Meridian Pass Set

(*) I ran some tests, but I didn't do it systematically.

Page under construction. Suggestions or requests are welcome

Created: 1999-07-12

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