Predict moon properties for the McDonald sky nd install them in an image header. This code relies ofn the script mcdsky.sh.

 
 
% moonsky --help 

Usage: skymoon 20180206T022042.6_acm_sci_proc.fits Y N 
arg1 - Name of LOCAL FITS image to be checked 
arg2 - install cards into header? (Y/N)
arg3 - run in debug mode? (Y/N)

% skymoon 20180402T081530.0_acm_sci_proc.fits Y N  

% imhead 20180402T081530.0_acm_sci_proc.fits > aa
% tail -7 aa
RSTRT   = '33.6189 '
HISTORY  SETHEAD WCSTools 3.8.7 2018-05-31T14:15 SKYSB and SKYSBERR updated
MILLUM  = '97.300  '
PHIMOON = '54.352863'
VSKYSB  = '17.571999'
HISTORY  SETHEAD WCSTools 3.8.7 2018-05-31T14:15 RSTRT updated
END