Converting from Gregorian Year (GY) to Sidereal Year (SY)

What is Gregorian Year (GY)

A Gregorian Year (GY) is the standard calendar year used in most of the world today. It is based on the time it takes for the Earth to complete one orbit around the Sun, which is approximately 365.2425 days.

What is Sidereal Year (SY)

A Sidereal Year (SY) is the time it takes for the Earth to complete one orbit around the Sun relative to the fixed stars. It is slightly longer than a Gregorian Year due to the precession of the Earth's axis, taking approximately 365.2564 days.

Conversion Formulas

To convert from Gregorian Year (GY) to Sidereal Year (SY), you can use the following formula:

SY=GY×0.999962

To convert from Sidereal Year (SY) to Gregorian Year (GY), you can use the following formula:

GY=SY×1.000038

Examples

• To convert 5 GY to SY:

SY=5×0.999962=4.99981

• To convert 9 SY to GY:

GY=9×1.000038=9.000342

• To convert 13 GY to SY:

SY=13×0.999962=12.99951

Use this page to perform converting from Gregorian Year (GY) to Sidereal Year (SY) for accurate astronomical calculations.