MadSci Network: Astronomy
Query:

Re: is there an equation that can estimate the length of sunlight in a day?

Date: Wed Dec 6 09:24:41 2000
Posted By: Amber Iler, Staff, Research Scientist, Veridian - ERIM International
Area of science: Astronomy
ID: 975707818.As
Message:

Erin,

The quick answer is that there *is* an equation that can be used with the information you mention to determine the length of sunlight in a day. Unfortunately, it's not a simple equation and uses a fair amount of spherical geometry, which is too difficult for me to explain here. However, there is an excellent web site on the length of day calculation and I strongly recommend it if you want all of the details. This site also includes a link to a Daylight Applet where you can use the toolbars to enter your coordinates and get the daylight information for any day you'd like.

I hope that sends you in the right direction,
Amber


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