I am using the C library that comes with the book Astronomical Algorithms by Jean Meeus http://www.willbell.com/math/mc1.htm(adsbygoogle = window.adsbygoogle || []).push({});

This book and C library has a calculation for two planets Conjunction and Opposition but no other planet aspects. Does anyone know a method to find when two planets are a fixed degree apart such as 90 degrees, 120 degrees or any other degree?

The problem I have run into is that geocentric planets move through a retrograde and direct cycle. As an outer planet approaches the transition from retrograde to direct it is almost stationary at which time I can not calculate any accurate degree of separation. So I need a proven method to calculate the date-time of exact angular separate even when two planets are almost stationary.

Any advice would be appreciated.

Thanks

Patrick

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# Need help finding exact time of planet aspects with Jean Meeus library

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