In essence, the dates of the sidereal zodiac change over time and the dates of the tropical zodiac do not. ... The most widely used of these equations is the Lahiri ayanamsa.

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

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 ...

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

Sidereal time (left) is measured with respect to background stars while solar time references the Sun. Earth needs to rotate nearly an extra degree for the Sun to pass the reference point; ...

To measure and display the running equation of time that enables instant reading of solar and civil times, Vacheron Constantin has specially developed a tropical gear train that emulates the ...

Sidereal year: The time necessary for the Earth to make one complete revolution around the sun; 365 days, 6 hours 9 minutes, 9.5 seconds. The calendar year is 365 days, and 366 days every fourth year.

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.

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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 ...