average_za¶
- sofia_redux.calibration.pipecal_util.average_za(header)[source]¶
Robust average of zenith angle from FITS header.
Keys used are ZA_START and ZA_END. If both are good (>= 0), they will be averaged. If only one is good, it will be returned. If both are bad, a PipeCalError will be raised.
- Parameters:
- header
astropy.io.fits.header.Header FITS header containing ZA keys.
- header
- Returns:
- float
The ZA value
- Raises:
- PipeCalError
If no valid ZA is found.