Calculate PW using Reitan's formula

Latitude (deg, + for N, - for S):
Longitude (deg, + for E, - for W):   (default coordinates for Philadelphia, PA, USA)
Date (mm/dd/yyyy): / /
Time (UT hr:min:sec): : :
Temperature (C):     Relative humidity (%):

Julian Day:
Earth/sun distance (AU):
Solar elevation angle (deg):
Relative air mass:
Dewpoint temperature (C):
PW (cm H2O) overhead: PW (cm H2O) along slant path:
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