Time since the peak of Roman Empire

Time since the peak of Roman Empire (1,900 y)

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Neat Ratios ...

Time since the peak of Roman Empire (1,900 y)

is 1/2500 of Age of earliest mammoth fossils (4.8 million y)...more
is 2.5 x Time since the birth of Marco Polo (770 y)...more
is 2.5 x Time since the birth of Dante Alighieri (759 y)...more
is 4 x Time since the publication of Copernicus's sun-centred model of the solar system (481 y)...more
is 5 x Time since the birth of Newton (381 y)...more
is 10 x Lifespan of Galapagos giant tortoise (190 y)...more
is 25 x Time since the invention of the transistor (76 y)...more
is 25 x Period of Halley's Comet's orbit (75.3 y)...more
is 40 x Time since Concorde Supersonic Airliner entered service (48 y)...more
is 40 x Time since first Apple ][ computer launched (47 y)...more
is 1000 x Period of Mars's orbit (1.88 y)...more

If this was a standard unit ...