The calculation of precession in Starry Night 6

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    We're using the equation seen here:  http://astronomical-almanac.sourcearchive.com/documentation/5.6-2/precess_8c-source.html

    With Laskar's coefficients.

    It can not be adjusted.

    Comments

    • Avatar
      Pierre-Luc Lévesque

      Hi Keiron,

      since everyone seems to be using a different method to compute precession, would'nt it be a good idea to stick to J2000 coordinates which evryone agrees on ?  For instance, I noticed that the ASCOM scope simulator (which I use) can't use J2000 and is forced to work with the precessed coordinates.

      Furthermore, I find confusing the fact that if I set Starry Night to January 1st 2000, I don't get the same RA, DEC for J2000 or JNOW.

      Is there a way for me to get the correct unprecessed coordinates expressed in J2000 through ASCOM's scope simulator ?

      Regards,

      Pierre-Luc Lévesque

    • Avatar
      Pierre-Luc Lévesque

      Nevermind ... I found it in the advanced panel of the telescope simulator.

    • Avatar
      Pierre-Luc Lévesque

      In fact, the option is there, but the simulator still shows coordinates in JNOW ...

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