Question

For each 1° difference in longitude, what is the change in local time?

Options

• 5 minutes

• 4 minutes

• 6 minutes

• 3 minutes

Answer 1

4 minutes

Explanation:

The change in local time for each 1° difference in longitude is 4 minutes. This is because the Earth completes a 360° rotation in 24 hours, so every degree corresponds to 4 minutes of time difference. Hence, for every 1° longitude, local time changes by 4 minutes. Earth rotates 360° in 24 hours, so 1° longitude corresponds to (24 × 60)/360 = 4 minutes time difference.