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Astronomy and Cosmology
Astronomy and Astrophysics
Trying to grok the draconic year
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[QUOTE="Janus, post: 6338986, member: 4"] It takes ~6798 days for the Moon's orbital plane to complete a 360 day precession. To get the 346 day draconic year, you need to use the formula: Td = 1/(1/Te+1/Tm)* where Te is the period of the Earth's orbit. (to be exact, the sidereal period of 365.256... days vs the Tropical year* of 265.242... days) And Tm is the period of the Moon sidereal orbital precession. * It is +1/Tm due to the direction the orbit precesses. If the orbit had precessed in the opposite direction, you would have needed to use -1/Tm instead. ** The Tropical year is what our calendar strives to keep in sync with. [/QUOTE]
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Trying to grok the draconic year
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