Time since the birth of Omar Khayyam

Time since the birth of Omar Khayyam (976 y)

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Time since the birth of Omar Khayyam (976 y)

is 1/5000 of Age of earliest mammoth fossils (4.8 million y)...more
is 2/5 of Time since start of building of the Parthenon (2,468 y)...more
is 2/5 of Time since the birth of Aristotle (2,400 y)...more
is 1/2 of Time since start of building of the Colosseum (1,950 y)...more
is 2 x Time since the publication of Copernicus's sun-centred model of the solar system (481 y)...more
is 4 x Time since birth of Sophie Germain (248 y)...more
is 4 x Period of Pluto's orbit (248 y)...more
is 4 x Time since the birth of Gauss (247 y)...more
is 5 x Time since the first passenger steam railway service (199 y)...more
is 10 x Time since Charles Lindbergh first flew across the Atlantic (97 y)...more
is 20 x Time since Concorde Supersonic Airliner entered service (48 y)...more

If this was a standard unit ...