[AstroPy] Calculating alt/az or zenith angle/parallactic angle

[Tim Staley]

Hi Tim,

you want something like the following:

    from astropy.coordinates import SkyCoord, AltAz, EarthLocation

    from astropy.time import Time
    import astropy.units as u

    obs_time = Time('2017-01-01T18:00')

    sky_posn = SkyCoord(0 * u.deg, 30 * u.deg)
    earth_location = EarthLocation.from_geodetic(0*u.deg, 35*u.deg)

    altaz = sky_posn.transform_to(
         AltAz(obstime=obs_time,
              location=earth_location))

    print(altaz.alt.deg, altaz.az.deg)


Cheers,
Tim

On 27/01/17 10:34, Tim Cornwell wrote:
> Hi
>
> I am given an hour angle and wish to calculate alt/az or zenith 
> angle/parallactic angle for a given SkyCoord and Location. After 
> reading the documentation and many tries, I cannot see how to do this 
> with the current Astropy Time/Angle classes. It is possible?
>
> Thanks,
> Tim
>
> -- 
> Tim Cornwell
> Sent with Airmail
>
>
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