EASA NAV(A)intermediate
15. What time difference corresponds to 20° of longitude?
Answer
1 h 20 min
Explanation
Earth rotates 15° per hour, so 20° corresponds to $20×4=80$ minutes, or **1 h 20 min**. **Key takeaway:** Each longitude degree corresponds to four minutes of solar time. **Glossary:** Longitude: east–west angular coordinate.
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