Originally Posted by cgkdisc
Civil twilight officially starts at sunset but sounds a little more official from a rules standpoint - realizing that few if any will look up sunset or civil twilight. But at least there's an official time for sticklers to reference.
Sunset is one specific time. Civil twilight is a duration of time and the quotation above says "after civil twilight". That requires players to know when "the geometric center of the sun reaches 6° below the horizon" which is the end of civil twilight. This is completely unnecessary complexity for the sake of sounding a little more official...?!
Please ask the rules makers to come to their senses and go with "Sunset", a time which is both common and visually observable if necessary.