On 9/15/2018 1:07 PM, Mike Horvath wrote:
> I'm trying to adapt the following PDF to POV-Ray code for my 
> planetarium/orrery.
> 
> https://ssd.jpl.nasa.gov/txt/aprx_pos_planets.pdf
> 

In Step 6 of that PDF, it gives an equation on how to convert between 
ecliptic coordinates and J2000 coordinates.

What is the inverse of that equation, and how do I change it into a 
series of `rotate` commands instead?

Thanks.



Mike

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