EASA NAV(A)intermediate
What is the local-time difference associated with 20° of longitude?
Answer
1 hour 20 minutes
Explanation
At four minutes per degree, 20° corresponds to 80 minutes, or 1 hour 20 minutes. The exact civil-time difference may not follow longitude because time zones are political conventions. **Key takeaway:** Longitude-based solar-time difference is 4 minutes per degree.\n\n**Glossary:** **Local mean time**: time referenced to the local meridian.
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