Dawn

Dawn is the first twilight of the day. That occurs before sunrise.

This short article about science can be made longer. You can help Wikipedia by adding to it.

v t e Times of the day
Daytime	Morning Midday Afternoon
Night	Evening Midnight Postmidnight
Twilight	Dawn Sunrise Sunset Dusk Blue hour
Related	Belt of Venus Canonical hours Golden hour Terminator Moonlight Midnight sun Polar night Watches of the night Zodiacal light