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Positional Astronomy help needed.

  1. Oct 30, 2011 #1
    Hello all,

    I'm a surveyor working on an Excel spreadsheet to convert FK5 positions into altitude and azimuth system. Yeah, I know there's an FK6, but one step at a time.
    I know it sounds simple, right.
    But I have to account for proper motion, precession, nutation, aberration, parallax, light deflection, polar rotation and refraction.
    I built the sheet and got very close to the USNO values (minus refraction, of course) but I need help tightening it up.

    I'm within about 30 seconds in azimuth and 10 seconds in altitude.
    I used Meeus mostly, so don't recommend that, please.

    If anyone would be willing to help, I would GREATLY appreciated it.

    Thanks, Scott
  2. jcsd
  3. Nov 3, 2011 #2
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