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from __future__ import division # confidence high
def diff_angles(a,b):
"""
Perform angle subtraction a-b taking into account
small-angle differences across 360degree line.
"""
diff = a - b
if diff > 180.0:
diff -= 360.0
if diff < -180.0:
diff += 360.0
return diff
def getBinning(fobj, extver=1):
# Return the binning factor
binned = 1
if fobj[0].header['INSTRUME'] == 'WFPC2':
mode = fobj[0].header.get('MODE', "")
if mode == 'AREA': binned = 2
else:
binned = fobj['SCI', extver].header.get('BINAXIS',1)
return binned
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