EASA NAV(A)intermediate
Civil twilight is the period before sunrise or after sunset when the midpoint of the Sun is 6° or less below which horizon?
Answer
The true horizon
Explanation
Civil twilight is defined using the Sun's centre and the true horizon, with the Sun no more than 6° below it. The 12° options describe a different twilight limit. **Key takeaway:** Civil twilight uses a 6° depression below the true horizon. **Glossary:** **True horizon**: The horizontal plane through the observer; **civil twilight**: Twilight while the Sun's centre is within 6° below that horizon.
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