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? ? ? ??? ?? ?????? ??? ???????
??? ??????	??? Chronometry Orders of magnitude ?????????
??? ???????? ?????	?? ?? ?? UTC offset UT ΔT DUT1 IERS ISO 31-1 ISO 8601 ?? ?? ??? ??? ????? 24-hour clock Barycentric Coordinate Time Civil time ???????? ???? ??? Geocentric Coordinate Time ??? ??? ????? ?? ????? ??? ????? New Earth Time ???? ????? Terrestrial Time ????? ???
????? ???????	Barycentric Dynamical Time Ephemeris time ????? ?????? ??? ??? ?????? ?????
??????? ??? ???	Absolute time and space ???? ? ???? Chronon Continuous time Coordinate time Cosmological decade Discrete time ????? ??? ????? ??? Proper time ????? ?????? ???? ???????? Gravitational time dilation ??? ???? T-symmetry
?? ???? ????	????? ????? ????? ????? Complication Equation of time ??? ????? ???? ???? ?? ????? ??? ???? Marine chronometer Marine sandglass Radio clock Sundial ???? Water clock
??????	Astronomical ????? ??? Epact ???????? ????? ?????? ???? ????? Intercalation ?????? Julian ??? ???? Lunisolar ???? Solar ???????? Tropical year Weekday determination ??
???? ????? ??? ??????	Dating methodologies ??????? ?????? ??? International Commission on Stratigraphy
Astronomical chronology	Galactic year Nuclear time scale ?? ?????? Sidereal time
??? ?? ???????	??? ?? ???? Fortnight ????? Jiffy Lustrum ?????? ????? Moment ????? Paksha Saeculum ????? Shake Tide ???? ???
?????? ???????	Chronology Duration Mental chronometry Metric time ????? ??? Time value of money ??? ????