Originally Posted By: Tim
there are actually three types of twilight: Civil, Nautical, and Astronomical.

You can get more information from the Navy on the different twilights.

Yes, but none of those name the time Bitt is talking about, which is the time the lower edge of the sun touches the horizon. The earliest-in-the-evening of those is "sunset", which is the time the upper edge of the sun touches the horizon, somewhat after the Bitt moment.

Peter