Common · Knowledge
Billion years
10⁹ (one billion) years; geological unit of time
Text: Wikipédia, CC BY-SA 4.0. · Image: Pablo Carlos Budassi (CC BY-SA 4.0) ·
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B★
Bya
Abbreviation for "billion years ago"
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A★★
Annum
Conventional fixed unit of time, derived of the SI system, equal to the mean duration of the tropic year independantly of the geographic location, estimated to 365.2422 fixed days of 86400 seconds, near from the mean year observed on ground
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1,000,000,000
Natural number with the value 10⁹, named one billion (short scale) or one milliard (long scale)
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Million years ago
Unit of a quantity of 1,000,000 years
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1,000,000,000,000
Natural number with the value 10¹²
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M★★
Millisecond
SI unit of time equal to one thousandth of a second