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  2. Astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Astronomical_clock

    Astronomical clock was installed in 1473 in the Torre dell'Orologio of the Palazzo della Ragione. Merano. Clock tower at the entrance to Merano town cemetery, installed in 1908 by Philipp Hörz of Ulm, [33] with a calendar dial showing the month, zodiac, and moon phase. Messina. The Messina astronomical clock in the tower of Messina Cathedral ...

  3. Shepherd Gate Clock - Wikipedia

    en.wikipedia.org/wiki/Shepherd_Gate_Clock

    One clock with large dial to be seen by the Public, near the Observatory entrance, and three smaller clocks, all to be moved sympathetically with the automatic clock. Airy also wanted the existing Greenwich time ball to be electrically operated, so that its descent at 13:00 was synchronised with the motor clock inside the observatory.

  4. Department of Defense master clock - Wikipedia

    en.wikipedia.org/wiki/Department_of_Defense...

    The master atomic clock ensemble at the U.S. Naval Observatory in Washington D.C., which provides the time standard for the U.S. Department of Defense. [1] The rack mounted units in the background are caesium beam clocks. The black units in the foreground are hydrogen maser standards.

  5. United States Naval Observatory - Wikipedia

    en.wikipedia.org/.../United_States_Naval_Observatory

    Atomic clock ensemble at the U.S. Naval Observatory. The U.S. Naval Observatory operates two “Master Clock” facilities, one in Washington, DC, and the other at Schriever SFB near Colorado Springs, CO. The primary facility, in Washington, D.C. maintains 57 HP/Agilent/Symmetricom 5071A-001 high performance cesium atomic clocks and 24 hydrogen ...

  6. Time synchronization in North America - Wikipedia

    en.wikipedia.org/wiki/Time_synchronization_in...

    COAA's Radio Clock [21] F6CTE's CLOCK [15] WWVH: 5, 10, and 15 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver; CHU: 3.33 MHz, 7.85 MHz, 14.67 MHz Bell 103 modem tones, decodable by most computer ...

  7. Prague astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Prague_astronomical_clock

    The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square.The clock mechanism has three main components – the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; statues of various Catholic saints stand on either side of the clock; "The Walk of the Apostles", an hourly show of moving Apostle figures ...

  8. Hampton Court astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Hampton_Court_astronomical...

    The clock face in the tower. The clock was installed in 1540 on the gatehouse to the inner court at Hampton Court Palace. It was designed by Nicholas Kratzer and made by Nicholas Oursian. [1] This pre-Copernican and pre-Galilean astronomical clock is still functioning.

  9. Constantinople observatory of Taqi ad-Din - Wikipedia

    en.wikipedia.org/wiki/Constantinople_Observatory...

    The Constantinople observatory of Taqi ad-Din, founded in Constantinople (today Istanbul) by Taqi ad-Din Muhammad ibn Ma'ruf in 1577, was one of the largest astronomical observatories in the pre-modern world. However, it only existed for a few years and was destroyed in 1580.