[AstroPy] RA/Dec to Alt/Az

[Russell Valentine]

Last time I wrote a function to do this if I wanted it adjusted for 
atmospheric refraction I needed to include pressure in the coordinate. I 
usually estimate this using elevation. The algorithm isn't totally 
stable especially at lower altitudes, so keep that in mind if you ever 
need to go back from AltAz to RADec. See notes section on this page: 
https://docs.astropy.org/en/stable/api/astropy.coordinates.AltAz.html

height = earth_location.height.to_value(u.m)
# https://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html
return 101325.0 * ((1.0 - 2.2557e-5 * height) ** 5.25588) * usi.Pa


On 4/22/23 15:53, Richard Moffat wrote:
>
> We can consider this question closed unless anyone else has anything 
> else to add.
>