Why December Has The Longest Days

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December has the longest solar days (noon-to-noon) because of the weird way a combination of the axial tilt of the earth and the eccentricity of its elliptical orbit conspire in December. Perihelion + Solstices = Long Days.

Here’s some more info about:

Solar Time:

The Equation of Time:

Milankovitch cycles:



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Music by Nathaniel Schroeder

Thanks to Nima Doroud for contributions. Created by Henry Reich

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