The angular velocity of Earth is 15° per hour. To calculate this result, consider these easy steps:
A rotation of Earth is exactly one day long, approximately 24 h.
A full rotation of Earth corresponds to 360°.
Dividing the angle above by the time of a full rotation gives us the result:
360°/24 h = 15° per h.
This is also the apparent speed of the Sun and stars in the sky. Since the Sun has a diameter of half a degree, we can calculate the length of the sunrise: 0.5/15° per h = 0.033 h ~ 2 min/ Read more