How many sidereal year in 1 Gregorian year? The answer is 0.99996205404883. We assume you are converting between sidereal year and Gregorian year. You can view more details on each measurement unit: sidereal year or Gregorian year The SI base unit for time is the second. 1 second is equal to 3.1687536047488E-8 sidereal year, or 3.1688738506811E-8 Gregorian 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 date calculatorto get your age in days or measure the duration of an event.
1 sidereal year to Gregorian year = 1.00004 Gregorian year
5 sidereal year to Gregorian year = 5.00019 Gregorian year
10 sidereal year to Gregorian year = 10.00038 Gregorian year
15 sidereal year to Gregorian year = 15.00057 Gregorian year
20 sidereal year to Gregorian year = 20.00076 Gregorian year
25 sidereal year to Gregorian year = 25.00095 Gregorian year
30 sidereal year to Gregorian year = 30.00114 Gregorian year
40 sidereal year to Gregorian year = 40.00152 Gregorian year
50 sidereal year to Gregorian year = 50.0019 Gregorian year
You can do the reverse unit conversion from Gregorian year to sidereal year, or enter any two units below:
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.
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.
ag = a_g = 365.2425 days for the mean Gregorian year
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