“We have known for thousands of years that the sky is full of harmonies and rhythms. Pythagoras called it the ‘music of the spheres.’ Great conjunctions of Jupiter and Saturn follow a number of such rhythms. The most obvious is the roughly 20-year gap between each conjunction, when the two giants appear close together on the sky. During this period, Saturn completes two-thirds of its 30-year orbit, while Jupiter completes one lap of its 12-year orbit plus two-thirds of its next one. The odd two-thirds of an orbit mean that successive conjunctions are separated in the sky by about 240 degrees. ...”
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