waggy wrote:

> Unless you or somebody else beats me to it, I'll see if I can package it all up
> for inclusion in the object library when I get more than a few minutes at a time
> to rub together (if that's alright).

No problem, if you think it's generally useful ... when you
package it up, note that the HourAngle macro still contains
a lot of unnecessary code as a result from copy and paste.

You can remove the line

   #local e= 0.016709-1.151E-9*d;

as well as the entire code block from

   // Obliquity of the ecliptic

up to

   #local RA = degrees ...

as that is only relevant for the sun, not distant stars.

Did you test it against your original star chart? The only
test I did was to see if the vernal point would rise due east
at spring equinox 6am so I hoped it was correct. But I did a
lot of trial and error with the signs: mixing three celestial
coordinate systems with POV-Ray's left-handed one caused a
bit of brain overload at times ;)

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