Girard-Perregaux 1966 Minute Repeater, Annual Calendar and Equation of Time (Photo courtesy of Girard-Perregaux) ... The astronomical dial shows sidereal time, ...

Thus, when we take the universe at large as some fixed entity, with respect to that entity, the earth completes an exact 360° rotation in an average time of only 23 Hours, 56 Minutes, 4.091 Seconds ...

Simply put, a sidereal year – it’s pronounced sy-dear-ee-al, by the way, despite being spelled side-real – is the amount of ...

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 ...

Jacob & Co. has silenced much of the criticism with its new Astronomia Sky (about $690,000). It incorporates a sidereal-time display that tracks the movement of the stars with zodiac indications.

HOURLY records of the intensity of the cosmic radiation have been made at Cape Town since February 1933 in accordance with a scheme organized by Steinke, Hess and others for the study of the ...