In the sport of cricket, a batsman reaches his century when he scores 100 or more runs in the innings.

It is regarded as a landmark score (the closest equivalent for bowlers would be either five wickets in an innings or ten wickets in a match) and recorded in players'
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A millennium (pl. millennia) is a period of time equal to one thousand years (from Latin mille, thousand, and annum, year).
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century (From the Latin cent, one hundred) is one hundred consecutive years.

• In all dating systems, centuries are essentially numbered ordinally. Thus, the first century of a time frame is "The First Century" and not "Century 0".

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calendar is a system for naming periods of time, typically days. These names are known as calendar dates. Cycles in a calendar are often synchronised with the perceived motion of astronomical objects.

A calendar is also a physical device (often paper).
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History is the study of the past, focused on human activity and leading up to the present day.^[1] More precisely, history is the continuous, systematic narrative and research of past events as relating to the human race ^[1]
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:See also:

Historical Eras, or classification of history, culture, and such into thematic groups involving time, so as to generate a history by period
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Periodization is the attempt to categorize or divide time into discrete named blocks. The result is a descriptive abstraction that provides a useful handle on periods of time with relatively stable characteristics.
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Physical cosmology

• Age of the universe
• Big Bang
• Blueshift
• Comoving distance
• Cosmic microwave background
• Dark energy
• Dark matter
• FLRW metric
• Friedmann equations
• Galaxy formation
• Hubble's law
• Inflation

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The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth.
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timeline of the evolution of life outlines the major events in the development of life on the planet Earth. For a thorough explanatory context, see the history of Earth, and geologic time scale. The dates given in this article are estimates based on scientific evidence.
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Pleistocene epoch (IPA: /'plaɪstəsi:n/) on the geologic timescale is the period from 1,808,000 to 11,550 years BP. The Pleistocene epoch had been intended to cover the world's recent period of repeated glaciations.
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A logarithmic timeline is a timeline laid out according to a logarithmic scale. This necessarily implies a zero point and an infinity point, neither of which can be displayed.
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Upper Paleolithic (or Upper Palaeolithic) is the third and last subdivision of the Paleolithic or Old Stone Age as it is understood in Europe, Africa and Asia. Very broadly it dates to between 40,000 and 10,000 years ago, roughly coinciding with the appearance of "high"
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10th millennium BC - 9th millennium BC
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10th millennium BC - 9th millennium BC - 8th millennium BC

The 9th millennium BC marks the beginning of the Neolithic period. Agriculture spreads throughout the Fertile Crescent and use of pottery becomes more widespread.
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9th millennium BC - 8th millennium BC - 7th millennium BC In the 8th millennium BC, agriculture becomes widely practiced in the Fertile Crescent and Anatolia. Pottery becomes widespread (with independent development in Central America) and animal husbandry (pastoralism)
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8th millennium BC - 7th millennium BC - 6th millennium BC During the 7th millennium BC, agriculture spreads from Anatolia to the Balkans. World population is essentially stable at around 5 million people, living mostly widely scattered across the globe in small
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7th millennium BC - 6th millennium BC - 5th millennium BC During the 6th millennium BC, agriculture spreads from the Balkans to Italy and Eastern Europe and from Mesopotamia to Egypt. World population is essentially stable at ca. 5 million people.
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6th millennium BC - 5th millennium BC - 4th millennium BC

4004 BC redirects here. For more information on 4004 BC, see Ussher chronology.

The 5th millennium BC
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Anno Domini (Latin: (In)The year of (Our) Lord^[1]), abbreviated as AD or A.D., defines an epoch based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth.
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Common Era, also known as Current Era or Christian Era, abbreviated CE, ^[1][2][3][4] is a designation for the period of time beginning with year 1 of the Gregorian calendar.
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4th millennium - 5th millennium - 6th millennium The fifth millennium is a period of time which will begin on 1 January 4001 and will end on 31 December 5000.

Astronomical events

• 4285 August 6: Venus occults Regulus

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5th millennium - 6th millennium - 7th millennium The sixth millennium is a period of time which will begin on January 1 5001 and will end on December 31 6000.

Astronomical events

• 5001 September 11: Mercury occults Regulus

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6th millennium - 7th millennium - 8th millennium The 7th millennium is a period of time which will begin on January 1 6001 and will end on December 31 7000.

Astronomical events

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7th millennium - 8th millennium - 9th millennium The eighth millennium is a period of time which will begin on January 1, 7001 and will end on December 31, 8000.

Astronomical events

All these dates are in a uniform time scale such as Terrestrial Time.
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8th millennium - 9th millennium - 10th millennium The 9th millennium is a period of time which will begin on January 1, 8001 and will end on December 31, 9000.

Time capsule

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9th millennium - 10th millennium - 11st millennium and beyond The tenth millennium is a period of time which will begin on January 1, 9001 and will end on December 31, 10,000.
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9th millennium - 10th millennium - 11st millennium and beyond The 11th millennium and beyond is a period of time which will begin on 1 January, 10001. Several predictions have been made concerning this future time period.
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Agriculture and forestry

• Agronomy
• Animal science
• Agrology
• Environmental science
• Agricultural economics
• Aquaculture

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