>>The day starts after sunset of the previous day, to be more precise, when the first star appears on the sky. During the year you have a calendar on when day starts and ends.
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>Not to quibble........... okay, I guess it's a quibble ....... but
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>I was under the impression that evening began when three stars were visible in the sky. Just curious as to which is "technically" correct.

Yes, I think it's three, you're right. Was thinking about lots of different things in the moment of writing...