Daylight Saving Time is an inconvenience to observational astronomy, since it is
one more thing to keep track of and avoid making mistakes with when reporting the
times of astronomical events.

It is used by governments as the most convenient way to get everyone to get up, go
to school or to work, and watch their favorite television programs an hour
earlier, so as to minimize electrical power consumption. Everyone knows it is
artificial, and has nothing to do with the real time of day, however one might
express that concept.

John Savard