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# Earth - Period

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Constant / Last modified by KurtHeckman on 2018/11/06 02:34
`"Earth"_"Period" = 365.25636304 days`

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vCalc.Earth - Period

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f10edb1b-e516-11e4-a3bb-bc764e2038f2

The Period of the Earth's orbital around the Sun is 365.25636304 days.

#### The Math / Science

Kepler's 3^{rd} Law of planetary motion states that the orbital period (**T**), mass of the system (**M**), the distance separating the objects (**R**), and the Universal Gravity Constant (**G**) are related in the following formula:

**where:**

- T is the period of the orbit.
- M is the total mass of the system
- R is the separation distance between the two objects.
- G is the universal gravity constant

In the case of the Earth's Period of Orbit, the mass of the system is the mass of the Sun plus the mass of the Earth, and the separation (R) is the mean radius of the Earth's orbit about the Sun.

#### Related Data

- Mean Radius of Earth's Orbit about the Sun also known as one Astronomical Unit
- Period of the Earth's Orbit
- Mass of the Earth
- Mass of the Sun

This constant,

**Earth - Period**, is used in 1 calculator.**Calculators**