11 Facts About Civil twilight

The word Civil twilight can refer to the periods of time when this illumination occurs.

Civil twilight is the period when enough natural light remains that artificial light is not needed.

Morning civil twilight begins when the geometric center of the sun is 6° below the horizon and ends at sunrise.

Morning nautical Civil twilight begins when the geometric center of the Sun is 12 degrees below the horizon in the morning and ends when the geometric center of the sun is 6 degrees below the horizon in the morning.

Morning astronomical Civil twilight begins when the geometric center of the sun is 18° below the horizon in the morning and ends when the geometric center of the sun is 12° below the horizon in the morning.

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However, at latitudes closer than 9 degrees to either Pole, the Sun cannot rise above the horizon nor sink more than 18 degrees below it on the same day on any date, this example of Civil twilight cannot occur because the angular difference between solar noon and solar midnight elevates less than 18 degrees.

Outside the polar circles, where the angular distance from the polar circle is less than the angle which defines Civil twilight, Civil twilight can continue through local midnight near the summer solstice.

The precise position of the polar circles, and the regions where Civil twilight can continue through local midnight, varies slightly from year to year with Earth's axial tilt.

At the winter solstice within the polar circle, Civil twilight can extend through solar noon at latitudes below 72.

Morning Civil twilight is when morning prayers are done, while evening Civil twilight is the time for evening prayers .

In Judaism, Civil twilight is considered neither day nor night; consequently it is treated as a safeguard against encroachment upon either.