Re: [Stellarium-pubdevel] How to implement alternate lat/lon grid?

[Georg Z. <geo...@un...>]

Hi!

Start with src/modules/GridLinesMgr.(hpp|cpp). When you understand how 
it works, it should be moderately easy to make e.g. a variant of 
ecliptic of date starting at Spica. You should however not touch 
precession code, unless you need to implement a particular Indian model. 
But then you need different models for everything!

Out of cultural astronomy interest: Do you have some english-language 
papers on this coordinate system? Is there a single "Indian" tradition, 
or are there several different "schools"? Maybe this tradition could be 
added in the description of the "Indian" skyculture. However, the main 
program cannot show this. Maybe a future "Cultures" plugin?

Good luck!

Georg




Am 25.09.2017 13:31, schrieb Shriramana Sharma:
> Hello. I'm a student/researcher of traditional Indian astronomy where
> the longitudes of bodies are given w.r.t. a zero point diametrically
> opposite Spica i.e. so that the longitude of Spica is fixed at 180°.
> 
> I would like to use Stellarium to illustrate the movement of the
> planets with this grid of reference displayed as an alternate to the
> ecliptic of date. I realize I will have to tweak the precession code
> for this (IIUC).
> 
> Please guide as to where in the code I should dig to find this. I have
> downloaded the 0.16.1 tarball.
> 
> Thank you!
> 
> --
> Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा
> 
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-- 
Dipl.-Ing. Dr. Georg Zotti
Ludwig Boltzmann Institute for
   Archaeological Prospection and
   Virtual Archaeology
   (LBI ArchPro)
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