EASA NAV(A)basic
Civil twilight is the period before sunrise or after sunset when the midpoint of the Sun's disk is…
Answer
6° or less below the true horizon
Explanation
Civil twilight is defined by the Sun's midpoint being no more than **6° below the true horizon**. The alternatives use an incorrect depression angle or the apparent rather than true horizon. **Key takeaway:** Civil twilight uses a 6° solar depression below the true horizon. **Glossary:** True horizon: the horizontal plane through the observer, excluding apparent effects.
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