How to Accurately Convert FK5 to Altitude and Azimuth?

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A surveyor is developing an Excel spreadsheet to convert FK5 positions into altitude and azimuth, acknowledging the complexity due to factors like proper motion, precession, and refraction. The current results are close to USNO values, with discrepancies of about 30 seconds in azimuth and 10 seconds in altitude. The surveyor primarily used Meeus for calculations but is seeking further assistance to improve accuracy. They have found a helpful resource from the IAU for others facing similar challenges. The discussion highlights the intricacies of astronomical calculations and the importance of precise data conversion.
Scott S
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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
 
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