Dawn has no duration: it's the time marking the start of Twilight, and there are 3 types of twilight (see image) but the common one is Civil. So, assuming the Q is "how long is Civil Dawn to Sunrise on Venus" the answer is 47 hours long! 1°= 7h 47m. image: https://t.co/Evhcjg0gOE https://t.co/CtXGBrUk6V pic.twitter.com/Vept0KIaWd
— Dr James O'Donoghue (@physicsJ) August 18, 2020
via Twitter https://twitter.com/physicsJ
August 18, 2020 at 08:09PM
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