# 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).

### Contents [show][hide]

Switch to reverse conversion:
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 0 1 2 3 4 5 6 7 8 9 [info] Decimal: Exponential:

### Calculation process of conversion value

• 1 month (sidereal) = (2360591.5104) / (31556952) = 0.074804167094465 year (Gregorian)
• 1 year (Gregorian) = (31556952) / (2360591.5104) = 13.368239215032 month (sidereal)
• ? month (sidereal) × (2360591.5104  ("s"/"month (sidereal)")) / (31556952  ("s"/"year (Gregorian)")) = ? year (Gregorian)

### 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

 Start value: [month (sidereal)] Step size [month (sidereal)] How many lines? (max 100)

visual:
month (sidereal)year (Gregorian)
00
100.74804167094465
201.4960833418893
302.2441250128339
402.9921666837786
503.7402083547232
604.4882500256679
705.2362916966125
805.9843333675572
906.7323750385018
1007.4804167094465
1108.2284583803911
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## Multiple conversion

Enter numbers in month (sidereal) and click convert button.
One number per line.

Converted numbers in year (Gregorian):
Click to select all

## 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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