How many days in 1 sidereal month?
The answer is 27.321662037037.

We assume you are converting between **day** and **sidereal month**.

You can view more details on each measurement unit:

days or
sidereal month

The SI base unit for **time** is the second.

1 second is equal to 1.1574074074074E-5 days, or 4.2362262070237E-7 sidereal month.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between days 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 calculator**
to get your age in days or measure the duration of an event.

1 days to sidereal month = 0.0366 sidereal month

10 days to sidereal month = 0.36601 sidereal month

20 days to sidereal month = 0.73202 sidereal month

30 days to sidereal month = 1.09803 sidereal month

40 days to sidereal month = 1.46404 sidereal month

50 days to sidereal month = 1.83005 sidereal month

100 days to sidereal month = 3.6601 sidereal month

200 days to sidereal month = 7.3202 sidereal month

You can do the reverse unit conversion from sidereal month to days, or enter any two units below:

days to millisecond

days to second

days to nanosecond

days to millennium

days to year

days to fortnight

days to century

days to quarter

days to shake

days to hour

A continuous period of 24 hours which, unless the context otherwise requires, runs from midnight to midnight.

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).

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