What are civil, nautical, and astronomical dawn?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
These are scientific classifications of dawn based on how far the sun is below the horizon:
- Astronomical dawn (18° below): Very faint light; sky still mostly dark
- Nautical dawn (12° below): Horizon becomes visible; used in navigation
- Civil dawn (6° below): Enough light for most outdoor activities
When people ask “what time is dawn,” they usually mean civil dawn.
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