HomeAstronomyWhat is astronomical twilight? | Space

What is astronomical twilight? | Space

Astronomical twilight is a period of time in which the sun is below the horizon but some of its light is still being scattered between air molecules and bounced back to an observer on the surface. 

Astronomical twilight generally happens twice each day: It begins in the morning before dawn or ends in the evening after sunset when the geometric center of the sun is 18 degrees below the horizon, according to the National Weather Service (NWS). When the sun is at or above 12 degrees below the horizon, it’s no longer astronomical twilight. 

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