safe_sidereal_time¶
- sofia_redux.scan.utilities.utils.safe_sidereal_time(t, kind, longitude=None, model=None)[source]¶
Calculate sidereal time, even if offline.
This is a wrapper around
Time.sidereal_time()in cases where the IERS table cannot be downloaded.- Parameters:
- tTime
The time for which to calculate the sidereal time.
- kindstr
May be one of {‘mean’, ‘apparent’} i.e., accounting for precession only, or also for nutation.
- longitudeunits.Quantity or float or numpy.ndarray, optional
The longitude on the Earth at which to compute the Earth rotation angle. If a float is provided, it should be in degrees.
- modelstr, optional
The precession model to use.
- Returns:
- longitudeunits.Quantity
The local sidereal time in hourangle units.