Solar Illumination Calculator

Abstract

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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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1977
Accession Number
ADA040091

Entities

People

  • Richard A. Goldsmith

Organizations

  • Air Force Technical Applications Center

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Calculators
  • Climate Change
  • Command And Control
  • Command And Control Systems
  • Computer Programs
  • Computers
  • Control Systems
  • Elevation
  • Equations
  • Errors
  • Illumination
  • Latitude
  • Nautical
  • Northern Hemisphere
  • Sea Level
  • Seasons

Fields of Study

  • Physics

Readers

  • Climatology
  • Computer Science.
  • Space Exploration and Orbital Mechanics.

Technology Areas

  • Fully Networked C3
  • Fully Networked C3 - Command and Control
  • Space
  • Space - Orbital Debris
  • Space - Satellites