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The Shepherd Gate Clock (51°28′41″N 0°00′05″W) is mounted on the wall outside the gate of the Royal Observatory, Greenwich building in Greenwich, Greater London. The clock, an early example of an electrically connected clock system, was a sympathetic clock mechanism controlled by electric pulses transmitted by a motor clock inside the ...
The Shepherd Gate Clock at the gates of the Royal Greenwich Observatory. This clock shows Greenwich Mean Time all year round, ie. it is not set to British Summer Time in the summer. A key instrument for determining time was the Airy Transit Circle (ATC), which was used primarily from 1851 to 1938. [21]
The Astrarium of Giovanni Dondi dell'Orologio was a complex astronomical clock built between 1348 and 1364 in Padova, Italy, by the doctor and clock-maker Giovanni Dondi dell'Orologio. The Astrarium had seven faces and 107 moving gears; it showed the positions of the sun, the moon and the five planets then known, as well as religious feast days.
The United States Naval Observatory (USNO) is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense. [2] Established in 1830 as the Depot of Charts and Instruments, it is one of the oldest scientific agencies in the United States ...
Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States. Lowell Observatory was established in 1894, placing it among the oldest observatories in the United States, and was designated a National Historic Landmark in 1965. [2][3] In 2011, the Observatory was named one of "The World's 100 Most Important Places" by ...
The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced. Located in Washington D.C., the U.S. Naval Observatory master clock is designated as the "DOD Master Clock". It is one of the two standard time and frequency references for the U ...