Solar illumination calculator

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Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7733009g&link_type=abstract

Unknown

Astronomy and Astrophysics

Astronomy

Mathematical Models, Sunlight, Sunrise, Sunset, Time Measurement, Astronomical Coordinates, Azimuth, Celestial Mechanics, Computer Programs, Elevation Angle

Scientific paper

A model of the earth's orbital relationship to the sun is developed. Equations for computing the solar declination, the equation of time, sunrise, sunset, the starting and ending times of the twilights, and the solar elevation and azimuth angles are developed. An explanation of the meaning of the cosine of the Greenwich Hour Angle Exceeding + or - 1.0 is given. The accuracy of the equations is discussed. The equations presented in this report were incorporated into a computer program written at USAFETAC for use by the World Wide Military Command and Control System (WWMCCS).

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