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To: BenLurkin

The lunar cycle is closer to 29.53 days. A lot of moon phase clocks have gears with 59 teeth (as did the Antikythera mechanism) that closely approximate two lunations. The Gregorian calendar has a sidekick lunar calendar good to about one day in 8,000 years on average, which is even better than the Gregorian calendar’s approximation of the solar year (365 + 1/4 -1/100 + 1/400 = 365.2425), which is only good to about one day in 3000 years. The lunar calendar is used with the Gregorian Calendar to calculate the date of Easter.


12 posted on 12/18/2020 10:57:44 AM PST by Lonesome in Massachussets ("Women's intuition" gave us the Salem witch trials and Kavanaugh hearings. Change my mind.)
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To: Lonesome in Massachussets; BenLurkin

The synodic month (which is the familiar one) is 29.53, the sidereal month is 27.something. :^)


17 posted on 12/18/2020 11:20:06 AM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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