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Calculation of Sunshine Duration Parameters

Ricardo J Salvador rjsalvad at iastate.edu
Fri Jun 19 17:43:16 EST 1992

SUNLIGHT, A Program to Calculate Sunshine Duration Parameters for
Evapotranspiration Models.

Enrique Troyo Die'guez
Centro de Investigaciones Biolo'gicas de Baja California Sur, A. C.
Apartado Postal 128, La Paz, Baja California Sur, Me'xico 23000.

The program, SUNLIGHT, was designed and developed to determine the
theoretical sunshine duration and related parameters needed to estimate
evapotranspiration of crops by means of solar radiation equations.  The
software was written in GW-BASIC version 2.02 to be used in a PC-DOS
environment.  Inputs required are the latitude of the site, in degrees,
and a selected period of time.  Outputs are (i) mean solar declination
for the period, (ii) mean value of the cosin magnitude of the sun
declination parameter, (iii) average sunshine duration in light-hours
per day, (iv) parameter percent of the number of light-hours per day
related to the annual total, (v) sunshine duration expressed as the
total number of lights hours for the given period, and (vi) percent of
light-hours for the study period related to the annual total.

Published in Agronomy Journal 84:542-545 (1992)

The program was developed for academic and scientific purposes.  For
an ASCII file or a copy of the program send a blank disk (5.25 or 3.5
inch) to Enrique Troyo Die'guez at the address listed above.

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