What is the earth's rotational speed per hour ?

Question

What is the earth's rotational speed per hour ?

Answer 1

What kind of units do you want?  If you want miles per hour, it would depend on your latitude.  If you want radians per hour it would be 2(pi)/24.

Answer 2

The rotational speed of a point on the equator is just over a thousand miles per hour (15 degrees per hour).  For other locations, multiply by the cosine of the latitude.

Answer 3

Relative to the sun, it is 15° per hour; relative to the stars, it is 14.96° per hour.

To get the angular speed at the equator in km/hour, multiply by 1/360th of the Earth's circumference, which is 40,075 km/360 = 111.32 km/degree.

15° per hour x 111.32 km/degree = 1669.8 km/hour.

To get the speed at your latitude, multiply by cosine(lat). It's actually about 0.1% less at mid latitudes because the Earth is fatter at the equator. So, for example, at 45° latitude, it's about 1180 km/hr.

If you like miles better the kilometers, multiply by .6214.