1 Oct

Each type of twilight depends on how far the sun is below the horizon after sunset of before sunrise.  During civil twilight, there’s enough light to find your way around with ease and Venus is visible; in nautical twilight the horizon is indistinct and the first stars come out.  True dark night begins at the end of astronomical twilight.  10 degrees equals one fist held out at arm’s length against the sky.  Credit TW Carlson

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