Time since the peak of Roman Empire

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

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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 (768 y)...more
is 2.5 x Time since the birth of Dante Alighieri (757 y)...more
is 4 x Time since the publication of Copernicus's sun-centred model of the solar system (479 y)...more
is 5 x Time since the birth of Newton (379 y)...more
is 10 x Lifespan of Galapagos giant tortoise (190 y)...more
is 20 x Time since Charles Lindbergh first flew across the Atlantic (95 y)...more
is 25 x Period of Halley's Comet's orbit (75.3 y)...more
is 50 x Time since first Apple Macintosh Computer launched (38 y)...more
is 1000 x Period of Mars's orbit (1.88 y)...more

If this was a standard unit ...