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Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to 1,000,000 years (i.e. 1 × 10 6 years), or approximately 31.6 teraseconds.
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Megayear is a related term of year. As nouns the difference between year and megayear is that year is the time it takes the Earth to complete one revolution of the Sun (between 365.24 and 365.26 days depending on the point of reference) while megayear is a million (10 6) years.
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May 25, 2018 · Both mega-annum(Ma) and mega-year(Myr) designate one million years. The distinction is that Ma is used to designate the time before present or geohistoric dates and Myr to designate a duration or span of time.
Mar 13, 2022 · mega-, “a factor of one million” + year one million years. 1935 J.W. Campbell, Jr. Night T. Shippey
Overview. megayear. Quick Reference. mega-, “a factor of one million” + year one million years. 1935 J.W. Campbell, Jr. Night T. Shippey Oxford Book of SF (1992) 111 With what we have learned in the ... From: megayear in The Oxford Dictionary of Science Fiction » Subjects: Literature. Related content in Oxford Reference. Reference entries.