# Average Angular Velocity of the Earth?

1. Nov 4, 2009

### IAmSparticus

1. The earth spins on its axis once a day and orbits the sun once a year (365.24 days). Take the positive direction for the angular displacement to be the direction of the earth's motion. Express your answers in radians/second.

2. Wavg = Delta Theta / Delta Time

3. Since the Earth rotates once during a day, the delta theta equals 2 Pi radians.
Time = 60 seconds (in a minute) * 60 minutes (in an hour) * 24 hours (in a day) = 84600 seconds.

Appartenly this is wrong accoring to the homework program WebAssign. What is wrong with my work?

Also, I got 1.99 * 10^-7 rad/sec for the angular velocity of the earth around the sun, which is apparently also wrong.

Help?

Last edited: Nov 4, 2009
2. Nov 5, 2009

### Redbelly98

Staff Emeritus
Rotation in 1 day is not exactly 2π, since in that time the Earth has moved along 1/365.24 of it's orbit.