Select all correct statements regarding aviation time reckoning and solar position.
Answer
Earth rotates at a rate of 15° of longitude per hour.
Explanation
UTC standardizes aviation timekeeping; Earth rotates 15° per hour, making 10° equal 40 minutes; and UTC+2 means local time is two hours ahead. Civil twilight uses a 6° depression, not 12°. **Key takeaway:** Know both the direction of time conversion and the 6° civil-twilight criterion. **Glossary:** **Civil twilight**: The interval when the Sun's centre is within 6° below the true horizon.