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Updated : 16/10/2016

GHowSAW Solar

Solar Data

For the determination of cloud types, hours of sunshine etc. a routine is required to calculate various solar parameters for a specified location, date and time:-

  • Time of Sunrise
  • Time of Sunset
  • Time of Solar Noon
  • The Azimuth, Zenith and Elevation of the sun
  • Total radiation, Normal and Horizontal radiation and the Diffuse radiation
    • Extra-terrestrial radiation (ETR) normal to the beam, W/m2, corrected for earth-sun distance variations and Julian day
    • Bird model direct radiation normal to the beam at the earth surface (W/m2)
    • Bird model direct radiation incident upon a horizontal surface (W/m2)
    • Bird model global radiation incident upon a horizontal surface (W/m2)
    • Bird model diffuse radiation incident upon a horizontal surface (W/m2)
  • The day fraction

The results for the current date and time (Time zone=+2 hours) at a location of Latitude = -26.154088°, Longitude = 28.33509°
and Altitude = 1675m are:-

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