What is dawn?
Dawn is the start of morning twilight. Unless stated otherwise it means civil dawn: the moment the Sun's centre is 6° below the horizon, when there is enough light to see clearly outdoors. Earlier stages are nautical dawn (12°) and astronomical dawn (18°), when the first faint glow appears.
| Phase | Sun below horizon | What you see |
|---|---|---|
| Civil twilight | 0° to 6° | Enough light to work outdoors; brightest planets appear |
| Nautical twilight | 6° to 12° | Horizon still visible at sea; bright stars visible |
| Astronomical twilight | 12° to 18° | Sky looks dark to most people; faint glow remains |
| Night | more than 18° | No sunlight scattered in the sky |