calculate_parallactic_angle

lsst.ts.observatory.control.calculate_parallactic_angle(location: EarthLocation, lst: Angle, target: ICRS) → Angle

Calculate the parallactic angle.

Parameters:
location: `astropy.coordinates.EarthLocation`

Observatory location.

lst: `astropy.coordinates.Angle`

Local sidereal time.

target: `astropy.coordinates.ICRS`

The observing target coordinates.

Returns:
Angle

Parallactic angle.

Notes

The parallactic angle is the angle between the great circle that intersects a celestial object and the zenith, and the object’s hour circle [1].