Planet Calendar

Introduction

Given the planetary parameters of a "normal" planetary system—i.e. a star much more massive than any planet, this calculator just reads off the number of days in a year, as well as how long each day is.

Note that many real-world planetary systems have two central stars; the coarse day-night cycle result will not change significantly by this unless the planet is very close (in which case you have dynamical instabilities anyway), albeit you will get a secondary weak-day-strong-day cycle which may be significant.

Calculator

Note: negative values indicate retrograde rotation.

Credits / See Also

See also a planet's orbital period.

This calculator was suggested by user Katharina.