How many sidereal month in 1 millennium? The answer is 13359.36296647. We assume you are converting between sidereal month and millennium. You can view more details on each measurement unit: sidereal month or millennium The SI base unit for time is the second. 1 second is equal to 4.2362262070237E-7 sidereal month, or 3.1709791983765E-11 millennium. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between months and millennia. Type in your own numbers in the form to convert the units!
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You can do the reverse unit conversion from millennium 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).
A millennium is a period of time equal to one thousand years. There are two main viewpoints about naming millennia and there was a popular debate leading up to the celebrations of the year 2000 as to whether 2000 was the beginning of a new millennium. Historically, there has been debate around the turn of the millennium, centuries and decades before.
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