Period of Halley's Comet's orbit

Period of Halley's Comet's orbit (75.3 y)

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Period of Halley's Comet's orbit (75.3 y)

is 1/400 of Time since first humans in Europe (30,000 y)...more
is 1/400 of Time since extinction of Neanderthals (30,000 y)...more
is 1/400 of Age of earliest sewing needle (30,000 y)...more
is 1/400 of Time since the earliest bread baking (30,000 y)...more
is 1/200 of Time since first humans in Americas (15,000 y)...more
is 1/50 of Age of earliest swords (3,700 y)...more
is 1/25 of Time since the peak of Roman Empire (1,900 y)...more
is 1/25 of Duration of Pandyan Empire (South India) (1,850 y)...more
is 1/10 of Time since the birth of Marco Polo (766 y)...more
is 1/10 of Time since the birth of Dante Alighieri (755 y)...more
is 1/5 of Time since the birth of Newton (377 y)...more
is 1/5 of Duration of Mali Empire (375 y)...more
is 2/5 of Lifespan of Galapagos giant tortoise (190 y)...more
is 1/2 of Time since the publication of Volume 1 of Marx's Das Kapital (153 y)...more
is 1/2 of Time since the birth of physicist Marie Curie (153 y)...more
is about as big as Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (76 y)...more
is 2.5 x Lifespan of horse (30 y)...more
is 5 x Lifespan of a cat (15 y)...more
is 40 x Period of Mars's orbit (1.88 y)...more

If this was a standard unit ...