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Gregorian year Julian year tropical year sidereal year anomalistic year draconic year lunar year Gaussian year |
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sidereal year |

How many year in 1 sidereal year?
The answer is 1.0000379473911.

We assume you are converting between **Gregorian year** and **sidereal year**.

You can view more details on each measurement unit:

year or
sidereal year

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

1 second is equal to 3.1688738506811E-8 year, or 3.1687536047488E-8 sidereal year.

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

Use this page to learn how to convert between years and years.

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
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to get your age in days or measure the duration of an event.

1 year to sidereal year = 0.99996 sidereal year

5 year to sidereal year = 4.99981 sidereal year

10 year to sidereal year = 9.99962 sidereal year

20 year to sidereal year = 19.99924 sidereal year

30 year to sidereal year = 29.99886 sidereal year

40 year to sidereal year = 39.99848 sidereal year

50 year to sidereal year = 49.9981 sidereal year

75 year to sidereal year = 74.99715 sidereal year

100 year to sidereal year = 99.99621 sidereal year

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

year to millisecond

year to second

year to nanosecond

year to decade

year to fortnight

year to day

year to millennium

year to quarter

year to hour

year to week

An average Gregorian year is 365.2425 days (52.1775 weeks, 8765.82 hours, 525949.2 minutes or 31556952 seconds). For this calendar, a common year is 365 days (8760 hours, 525600 minutes or 31536000 seconds), and a leap year is 366 days (8784 hours, 527040 minutes or 31622400 seconds). The 400-year cycle of the Gregorian calendar has 146097 days and hence exactly 20871 weeks.

a_{g} = a_g = 365.2425 days for the mean Gregorian year

A sidereal year (from Latin sidus "asterism, star") is the time taken by the Earth to orbit the Sun once with respect to the fixed stars. Hence it is also the time taken for the Sun to return to the same position with respect to the fixed stars after apparently travelling once around the ecliptic. It equals 365.25636 SI days for the J2000.0 epoch.

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