CK-12 Foundation
Ck 12: Trigonometry: Angular Velocity
[Free Registration/Login may be required to access all resource tools.] Measure angular velocity.
Khan Academy
Khan Academy: Rotation
An explanation of the rotation function using angular measurement.
Wikimedia
Wikipedia: Latitude
This encyclopedia article from Wikipedia on latitude tells what it is, lists some latitudes of particular importance, and tendencies that latitudes can determine. Links are provided throughout for additional information.