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desihub / desimeter

DESI coordinates and transformations
BSD 3-Clause "New" or "Revised" License
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Field rotation prediction #48

Closed julienguy closed 4 years ago

julienguy commented 4 years ago

Turn on aberration and polar misalignment and add utility functions and a script to get the predicted field rotation and its derivative with time. Example

desi_predict_fieldrot --ra 20 --dec 80 --ha 0 --mjd 58800
FIELDROT    = 0.251 deg
DFIELDROTDT = -1.598 arcsec/min

desi_predict_fieldrot --fits /project/projectdirs/desi/spectro/data/20200206/00047450/guide-00047450.fits.fz 
FIELDROT    = -0.020 deg
DFIELDROTDT = 0.075 arcsec/min
julienguy commented 4 years ago

also self merging.