A solar day is defined by the Sun's return to the local meridian, while a sidereal day is defined by the return of the March equinox to the local meridian. A solar day is approximately 3 minutes and ...
The autumnal equinox this year is at 7:03 p.m. Sept. 22. We typically think of the first day of fall as something that happens all day long, but the equinox is the time when the sun crosses the ...
OBSERVATORY practice in the past has always been to use separate clocks for indicating solar and sidereal time. In the case of quartz crystal clocks, this practice could be continued by using two ...
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