Dawn - Technical Definitions

Technical Definitions

There are also more technical definitions of dawn, including the following:

Astronomical dawn
the moment after which the sky is no longer completely dark; formally defined as the time at which the sun is 18 degrees below the horizon in the morning.
Nautical dawn
the time at which there is enough sunlight for the horizon and some objects to be distinguishable; formally, when the sun is 12 degrees below the horizon in the morning.
Civil dawn
that time at which there is enough light for objects to be distinguishable, so that outdoor activities can commence; formally, when the sun is 6 degrees below the horizon in the morning.

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