UO Solar Radiation Monitoring Laboratory

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Solar position calculator

This calculator program returns solar zenith angle, declination, Julian day, equation of time, hour angle, instantaneous and daily extraterrestrial radiation values, and sunrise and sunset times. Equations were provided by the National Renewable Energy Laboratory.
Step 1—Specify date and time

  Year
  Month
  Day
  Hour
  Minute
  Second

Step 2—Specify Location and time adjustments

  Latitude
  (South negative)
  Longitude
  (West negative)
  Time zone

Step 3—Specify other conditions

  Pressure (mB)
  Temperature (C)
  Aspect

Step 4—Click the Calculate results button

 

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© 2022, UO Solar Radiation Monitoring Laboratory.
Last revised: March 6, 2022.

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Home page URL: solardata.uoregon.edu