Winter solstice: The science behind the shortest day of the yr

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The winter solstice heralds the astronomical begin of winter and marks the day with the fewest hours of daylight for the yr. However what is the science behind the shortest day and longest evening?

The winter solstice — and for that matter, the 4 seasons — happen as a result of Earth is tilted at an angle of about 23.5 levels relative to the solar. As a substitute of rotating on a straight axis, our planet is “tipped a bit,” mentioned Michael S. F. Kirk (opens in new tab), a analysis astrophysicist within the Heliophysics Science Division at NASA’s Goddard Area Flight Heart in Greenbelt, Maryland.

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