Spring is finally here – it began at 5:45 Friday afternoon – and although you may not notice, this spring will be about a half minute shorter than it was last year. For thousands of years, spring has been losing time in the Northern Hemisphere. This year, summer is the longest season, with 93.65 days, followed by spring with 92.76 days, autumn with 89.84 days and winter with 88.99 days.
The reason for the change has to do with the earth’s wobble on its axis, its 23.5° tilt, and the difference in the earth’s orbital speed at perilhelion vs. aphelion. You can get a detailed explanation HERE.
Or, you could just enjoy Frank Loesser’s explanation as offered by Ella Fitzgerald:
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