Initial Conditions: A Physics History Podcast cover image

The Legacy of Ptolemy’s Almagest

Initial Conditions: A Physics History Podcast

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How to Calculate the Processus of the Equinox

Talmi's calculations had been compounded over 700 years since the alma jest was published. He concluded that the procession of the equinox was changing very slowly, about 1 degree per 100 years. But an ancient astronomer looking at where the constellations are at the same time every year will be in a different place after 100 years. So you have to live a long life to notice something like this.

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