Can I calculate sunshine hours or daily daylight using these: Civil Twilight, Nautical Twilight, or Astronomical Twilight

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Duncan Smart

you could use the Nautical Almanac with the "sunrise" and "sunset" tabs to calculate daylight hours.

://www.nauticalalmanac.it/en/navigation-astronomy/the-nautical-almanac.html

Daniel Simonet

Thanks a lot !

When I am trying to compute evapotranspiration using the Thornwaite equation, what do I use for sunshine hours? Is it the difference between Civil Twilight, Nautical Twilight, Astronomical Twilight at sunrise and sunset, or is it the Length of Visible Light, or is it the Length of Day ?