#----------------------------Slit info ------------------------------------
# This info is needed to calculate how far the center of the slit
# is away from the limb. Wwe are assuming the edge of the slit
# is placed on the limb of the planet (theta = 90). however, if 
# the width of the slit is perpendicular to the tangent of Venus'
# limb, then the slit width cuts through longitude.  If the slit width
# is parallel to the tangent of the Venusian limb, then the slit length
# cuts to longitude and you will cover a larger zenith angle.
# We want to find the zenith angle at the center of the slit.  See
# reduction notes for diagram and full description.
# 
# The slit angle is the angle measured from the base of the ecam image
# (the horizontal of the ecam image drawn across the center of the) and the
# spot of the slit on Venus.  Measure from base. Go from 0 - 90.
#
# Best way to see the slit on the ds9 image is to use 'linear' and 'zscale' 
# together.
#
#
#---------------------------------------------------------------------------
#
# Delta		Slit		Slit	  Outside	Slit Angle	
# (AU)		Width	   	Height	  Zenith angle	on Venus	
#		(arcsec)  	(arcsec)  of slit	(degrees from
#		                           		 ecam horizontal)
#---------------------------------------------------------------------------
0.707		1.6		3.2	   80		45
0.707		1.6		3.2	   30		45