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PlanetCalc.txt - A description of how to compute the position of the planets based on Kepler's equation. This requires a recent accurate coordenats be supplied in order to get accurate results. Even though the paper mainly focuses on "real" planets, you can also use the same equations for predicting the positions of comets and asteroids. By Paul Schlyter.

How to Compute the day of the week for any date in your head. This page shows an algorithm you can use to quickly compute the day of the week for any date in your head.