The definition of a "Civil Twilight" is...
The time between the moment of sunset, when the
sun's apparent upper edge is just at the horizon, until the center of the sun is
6° directly below the horizon.
How the hell can you tell?
If the top of the sun is at the edge of visibility ad the center of the sun is below the horizon, ie,out of sight, How the hell can you tell when the center is at 6° of anything?
And does it happen sooner for some one who is five feet tall than for the guy who is six foot two? Or..Visa versa.
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