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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: https://en.wikipedia.org/wiki/Solar_time

The Equation of Time: https://en.wikipedia.org/wiki/Equation_of_time

Milankovitch cycles: https://en.wikipedia.org/wiki/Milankovitch_cycles

Perihelion: https://en.wikipedia.org/wiki/Perihelion_and_aphelion

Apsis: https://en.wikipedia.org/wiki/Apsis

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Thanks to Nima Doroud for contributions. Created by Henry Reich