The time of months and one year is measured by calendar.
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The accuracy of the Gregorian calendar results from the close agreement between the length of its average year, 365.2425 calendar days, and that of the tropical year. A calendar month may contain 28 to 31 calendar days; the average is 30.437. The synodic month, the interval from New Moon to New Moon, averages 29.531 d.
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