###
What is the speed of the Earth's rotation?

**
**

**
At the equator, the circumference of the Earth is 40,070 kilometers, and the
day is 24 hours long so the speed is 1670 kilometers/hour ( 1070 miles/hr).
This decreases by the cosine of your latitude so that at a latitude of 45
degrees, cos(45) = .707 and the speed is .707 x 1670 = 1180 kilometers/hr.
You can use this formula to find the speed of rotation at any latitude.
**

**
****
Return to the Ask the Space Scientist main page.
****
All answers are provided by Dr. Sten Odenwald (Raytheon STX)
for the **

NASA IMAGE/POETRY
Education and Public Outreach program.