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Astronomical clocks (6 C, 10 P) E. Equinoxes ... Summer solstice (2 C, 40 P) Pages in category "Time in astronomy" ... Decimal time; Dynamical time scale; E. Eclipse ...
The astronomical clock in the tower of the New Town Hall was installed in 1910. Kryštofovo Údolí. The Kryštofovo Údolí astronomical clock is a modern astronomical clock (inaugurated in 2008), built-in a former electrical substation. Hojsova Stráž. An astronomical clock in the Bohemian Forest was inaugurated in 2017. It has a concentric ...
Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.
A definition of a terrestrial time standard was adopted by the International Astronomical Union (IAU) in 1976 at its XVI General Assembly and later named Terrestrial Dynamical Time (TDT). It was the counterpart to Barycentric Dynamical Time (TDB), which was a time standard for Solar system ephemerides, to be based on a dynamical time scale ...
The term ephemeris time (often abbreviated ET) can in principle refer to time in association with any ephemeris (itinerary of the trajectory of an astronomical object). In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, [1] and superseded during the 1970s. [2]
TCB was defined in 1991 by the International Astronomical Union, in Recommendation III of the XXIst General Assembly. [1] It was intended as one of the replacements for the problematic 1976 definition of Barycentric Dynamical Time (TDB). Unlike former astronomical time scales, TCB is defined in the context of the general theory of relativity.
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