Geocentric computations

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Anonymous
2013-05-27
2013-05-31

  • Anonymous
    2013-05-27

    Dear Stellarium developers,
    I am using Stellarium for long time and now i wish to understand how sky mechanic works. I am looking over the internet, but I cannot find any computation formulas. Where I can learn them? Only one thing i found is that in every cases i had to compute with Julian date. But how to compute, where is now Sun relative to Earth or Mars or Saturn etc. I cannot found. Isn't it secret? :-)

     
  • barrykgerdes
    barrykgerdes
    2013-05-27

    The formula for making astronomical calculations have been available for a long time.
    I use a book (out of print ?) called "astronomy with your personal computer" by Peter Duffet-Smith. This book explains the formula and give working examples written in BASIC that can be assembled into programs to calculate all the info you need.

    Barry

     
    Last edit: barrykgerdes 2013-05-27
  • qam1
    qam1
    2013-05-31

    If you want to see how they are used in scripts, download my ephemeris scripts at

    http://www.lowerwolfjaw.com/astro/Stellarium/pe.htm

    In the script file (open with Notepad) I calculate all the ephemeris (i.e. elongation, ra, dec, phase) for each planet (as opposed to reading them "directly" from Stellarium).

     


Anonymous


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