# How does one calculate the length of a planet's solar year?

I have a planet with a specified sidereal day and sidereal year, and a solar day. But how can I determine the length of its solar year from this?

Sidereal day: 1d 1h 52m 11s

Solar day: 1d 1h 54m 36.45402s

Sidereal year: 379d 5h 54m

Semi-major axis: 0.9675 au (144,735,939.90225 km)

Orbital eccentricity: 0.272

Periapsis: 0.704 au (105,316,900.9728 km)

Apoapsis: 1.231 au (184,154,978.8317 km)

Axial tilt: 9.87°

• Your answer is in your question. – Vincent May 20 '18 at 20:47
• How is this about worldbuilding? This looks like you have a math homework question or something and you're posting it here because you don't want to solve it. – Aify May 20 '18 at 22:57
• Are you actually Egoraptor? I don't feel like Arin has ever shown an interest in this sort of thing at all. – Southpaw Hare May 21 '18 at 18:57
• @Aify This: "questions regarding real world stuff are on-topic." Been there done that with energy release of two colliding planets question. That was determined to be on-topic. Plugging in numbers here is no different. – elemtilas May 27 '18 at 13:04