How many seconds in 1 sidereal year?
The answer is 31558149.504.
We assume you are converting between second and sidereal year.
You can view more details on each measurement unit: seconds or
sidereal year
The SI base unit for time is the second.
1 second is equal to 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 seconds and years.
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sidereal year to seconds, or enter any two units below:

The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.

››Definition: 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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