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divisions of the calendar as well as arcs according to a sexagesimal system of counting, but none used the term second, and none was a precursor to the modern. Pop Culture, reuters, who is Tammie Jo Shults? Italia, magyarorszg, nederland, polska, portugal, romnia, sverige. 4 Civil time is defined to agree with the rotation of the earth. The Opus Majus of Roger Bacon. Timekeeping standards edit A set of atomic clocks throughout the world keeps time by consensus: the clocks "vote" on the correct time, and all voting clocks are steered to agree with the consensus, which is called International Atomic Time (TAI). New York: Dial Press. This time scale "ticks" the same atomic seconds as TAI, but inserts or omits leap seconds as necessary to correct for variations in the rate of rotation of the earth. Optical lattice clock edit While they are not yet part of any timekeeping standard, optical lattice clocks with frequencies in the visible light spectrum now exist and are the most accurate timekeepers of all. Time Service Department, United States Naval Observatory.

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It had a pendulum length of just under a meter which gave it a swing of one second, and an escapement that ticked every second. 1952." McCarthy, Dennis. Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac (1961 Sec. Translated by Sachau. 9 It may be noted that 60 is the smallest multiple of the first 6 counting numbers. Clock time (that is, civil time ) is set, directly or indirectly, to Coordinated Universal Time, which includes leap seconds.