How many sidereal month in 1 tropical month? The answer is 0.99999699736286. We assume you are converting between sidereal month and tropical month. You can view more details on each measurement unit: sidereal month or tropical month The SI base unit for time is the second. 1 second is equal to 4.2362262070237E-7 sidereal month, or 4.236238926912E-7 tropical month. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between months and months. 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 month = 1 tropical month
5 sidereal month to tropical month = 5.00002 tropical month
10 sidereal month to tropical month = 10.00003 tropical month
15 sidereal month to tropical month = 15.00005 tropical month
20 sidereal month to tropical month = 20.00006 tropical month
25 sidereal month to tropical month = 25.00008 tropical month
30 sidereal month to tropical month = 30.00009 tropical month
40 sidereal month to tropical month = 40.00012 tropical month
50 sidereal month to tropical month = 50.00015 tropical month
You can do the reverse unit conversion from tropical month 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 tropical month is the average time for the Moon to pass twice through the same equinox point of the sky. It is 27.32158 days, very slightly shorter than the sidereal month, because of precession of the equinoxes.
We default to using the Gregorian month on this site, but you can select any type of month by entering the full name like "tropical month".
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