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Need help finding exact time of planet aspects with Jean Meeus library 
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#1
Jul1114, 09:50 AM

P: 1

I am using the C library that comes with the book Astronomical Algorithms by Jean Meeus http://www.willbell.com/math/mc1.htm
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 datetime of exact angular separate even when two planets are almost stationary. Any advice would be appreciated. Thanks Patrick 


#2
Jul1414, 11:41 PM

Admin
P: 9,700

I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?



#3
Jul1514, 04:18 PM

P: 627

I think you're looking for a "Fundamental Solar System ephemeris".
I have never used such a thing, but there seems to be something useful at this site: http://ssd.jpl.nasa.gov/ 


#4
Aug514, 08:00 AM

P: 127

Need help finding exact time of planet aspects with Jean Meeus library
The only way to do this exactly is to run a fullblown ephemeris of the Solar System and interpolate. Meeus gives you some handy formulae to approximate a number of interesting configurations, but these are indeed approximations boiled down from the full ephemera.



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