On 9/20/2018 8:17 PM, Mike Horvath wrote:
> 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

I found the inverse on Wikipedia.

https://en.wikipedia.org/wiki/Ecliptic_coordinate_system#Conversion_between_celestial_coordinate_systems

Still not sure how to replace the equation with a series of `rotate` 
commands though.


Mike

Post a reply to this message