Initial Conditions: A Physics History Podcast cover image

The Legacy of Ptolemy’s Almagest

Initial Conditions: A Physics History Podcast

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The Processus Movement of the Equinox

The stars are slowly shifting westward in our sky, which moves it along our calendar. Because there are 360 degrees in a circle and 365 days in a year, the procession of the equinox is about one day every 70 years. By the time you get to 700, that, we said, was noticed that it was movement much faster. Actually, it was moving 1 degree every 66 or 70 years or so.

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