??????:Time topics - ????????? ??? ?? ?????

?????? : Time topics

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Key concepts

Measurement
and standard s

Chronometry	UTC UT TAI Unit of time Orders of magnitude (time)
Measurement system s	Italian six-hour clock Thai six-hour clock Hindu 12-hour clock 24-hour clock Relative hour ??? ?????? Decimal Hexadecimal Metric Sidereal Solar ??? ????????
????? s	Main types Solar Lunar Lunisolar Gregorian Julian Hebrew Islamic Solar Hijri Chinese Hindu Panchang Maya List
????? s	Main types astronomical astrarium atomic quantum hourglass marine ???? ?????? watch mechanical stopwatch water-based Cuckoo clock Digital clock Grandfather clock History Timeline

Philosophy of time

Religion
Mythology

Human experience
and use of time

Time in ???

???????	Geological time age chron eon epoch era period Geochronology Geological history of Earth
Physics	Absolute space and time Arrow of time Chronon Coordinate time Proper time ???????? ?????? ???????? Time domain Time translation symmetry Time reversal symmetry
Other fields	Chronological dating Chronobiology Circadian rhythm s Clock reaction Glottochronology Time geography

Related topics

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