# At what speed does the earth travel on its orbit around the sun?

Jan 10, 2016

The Earth moves at a little over 100,000 km/hr in its orbit around the sun.

#### Explanation:

The Earth is in a roughly circular orbit with a radius of 149,597,871 km.
The circumference of the orbit is $2 \cdot \pi \cdot r$ or 939,951,145 km. Since the Earth completes the orbit in one year (365.25 days, or 8766 hours), the speed is 107,227 km/hr, or 66,628 mph.