Past

For other uses, see PAST (disambiguation) and The Past (disambiguation).

Everything is in the past (Vassily Maximov, 1889).

Look up past in Wiktionary, the free dictionary.

The past is a term used to indicate the totality of events which occurred before a given point in time. The past is contrasted with and defined by the present and the future. The concept of the past is derived from the linear fashion in which human observers experience time, and is accessed through memory and recollection. In addition, human beings have recorded the past since the advent of written language.

The past is the object of such fields as history, memory, flashback, recollection, archaeology, archaeoastronomy, chronology, geology, historical geology, historical linguistics, law, ontology, paleontology, paleobotany, paleoethnobotany, palaeogeography, paleoclimatology, and cosmology.

References

Chronometry	UTC UT TAI Unit of time Planck time Second Minute Hour Day Week Month Year Decade Century Millennium Tropical year Solar year Sidereal year

Measurement systems	Time zone 12-hour clock 24-hour clock Daylight saving time New Earth Time Solar time Sidereal time Metric time Decimal time Hexadecimal time

Calendars	Gregorian Julian Hebrew Islamic Lunar Solar Hijri Mayan Intercalation Leap second Leap year

Clocks

Chronology
History

Religion
Mythology

Philosophy of time

Human experience
and use of time

Time in

Geology	Geological time age chron eon epoch era period Geochronology Geological history of Earth

Physics	Absolute time and space Arrow of time Chronon Coordinate time Imaginary time Planck epoch Planck time Proper time Rate Spacetime Theory of relativity Time dilation gravitational Time domain T-symmetry

other subject areas	Chronobiology Circadian rhythms Dating methodologies in archaeology Time geography

Past

References

See also