month (sidereal) to year (Gregorian) conversion

Conversion number between month (sidereal) and year (Gregorian) [a, y, or yr] is 0.074804167094465. This means, that month (sidereal) is smaller unit than year (Gregorian).

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from year (Gregorian) to month (sidereal) conversion

Enter the number in month (sidereal):

Decimal Fraction Exponential Expression
month (sidereal)
eg.: 10.12345 or 1.123e5

Result in year (Gregorian)

precision [info]

Calculation process of conversion value

High precision conversion

If conversion between month (sidereal) to second and second to year (Gregorian) is exactly definied, high precision conversion from month (sidereal) to year (Gregorian) is enabled.

Since definition contain rounded number(s) too, there is no sense for high precision calculation, but if you want, you can enable it. Keep in mind, that converted number will be inaccurate due this rounding error!


month (sidereal) to year (Gregorian) conversion chart

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month (sidereal)year (Gregorian)
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Multiple conversion

Enter numbers in month (sidereal) and click convert button.
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Converted numbers in year (Gregorian):
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Details about month (sidereal) and year (Gregorian) units:

Convert Month (sidereal) to other unit:

month (sidereal)

Definition of month (sidereal) unit: ≈ 27.321661 days. "It is the time it takes the Moon to go around Earth measured from a fixed point. Sideric month is not completely constant, an average value has been used for calculating."

Convert Year (Gregorian) to other unit:

year (Gregorian)

Definition of year (Gregorian) unit: = 365.2425 d average. As the common year has 365 days, the Gregorian calendar with leap years compensate the deviation from the real, astronomical year. According to this calendar, every 4th year is a leap year, except for every 100th. But every 400th is a leap year. This means that there are 97 leap years in 400 year period. So according to Gregorian's calendar, one year has 365 + 97/400 days (average). This is not a perfect approach, but in 1000 year period, the defiation is only 0.3 days compared to the astronomical year. In the year 1582 Gregorian replaced the Julian calendar.

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