How many sidereal month in 1 tropical year? The answer is 13.36822745832. We assume you are converting between sidereal month and tropical year. You can view more details on each measurement unit: sidereal month or tropical year The SI base unit for time is the second. 1 second is equal to 4.2362262070237E-7 sidereal month, or 3.1688765172731E-8 tropical year. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between months and years. Type in your own numbers in the form to convert the units!
You may also want to find out how many days are between two dates on the calendar. Use the date calculatorto get your age in days or measure the duration of an event.
1 sidereal month to tropical year = 0.0748 tropical year
10 sidereal month to tropical year = 0.74804 tropical year
20 sidereal month to tropical year = 1.49608 tropical year
30 sidereal month to tropical year = 2.24413 tropical year
40 sidereal month to tropical year = 2.99217 tropical year
50 sidereal month to tropical year = 3.74021 tropical year
100 sidereal month to tropical year = 7.48042 tropical year
200 sidereal month to tropical year = 14.96085 tropical year
You can do the reverse unit conversion from tropical year to sidereal month, or enter any two units below:
The sidereal month is defined as the Moon's orbital period in a non-rotating frame of reference (which on average is equal to its rotation period in the same frame). It is about 27.32166 days (27 days, 7 hours, 43 minutes, 11.6 seconds). The exact duration of the orbital period cannot be easily determined, because the 'non-rotating frame of reference' cannot be observed directly. However, it is approximately equal to the time it takes the Moon to pass twice a "fixed" star (different stars give different results because all have proper motions and are not really fixed in position).
The mean tropical year is defined as the period of time for the mean ecliptic longitude of the Sun to increase by 360 degrees. Since the Sun's ecliptic longitude is measured with respect to the equinox, the tropical year comprises a complete cycle of the seasons; because of the biological and socio-economic importance of the seasons, the tropical year is the basis of most calendars.
The International Union of Pure and Applied Chemistry and the International Union of Geological Sciences have jointly recommended using defining the annus, with symbol a, as the length of the tropical year in the year 2000:
a = 31556925.445 seconds (approximately 365.24219265 ephemeris days)
We default to using the Gregorian year on this site, but you can select a specific type of year by entering the full name like "tropical year".
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