IS THIS THE AREA OF THE BEACH?

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Astronomer Dan Joyce tells us that most widely recognized definitions
for darkness are civil, nautical and astronomical twilight which occur
when the sun sinks six, 12 and 18 degrees below the horizon
respectively. Once astronomical twilight ends, astronomers are assured
that no extraneous light will appear on their telescopic images. In
rural areas, most people will stop noticing atmospheric illumination
shortly after nautical twilight ends, but city dwellers will not perceive
much difference beyond the end of civil twilight. There are small
variances during the year but in general the time from sunset to the end
of civil twilight is about 30 minutes with another 30 minutes for
nautical twilight and an additional 25 minutes for astronomical
twilight.