Time since the publication of Darwin's On the Origin of Species

Time since the publication of Darwin's On the Origin of Species (163 y)

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Neat Ratios ...

Time since the publication of Darwin's On the Origin of Species (163 y)

is 1/40 of Age of the earliest city (6,500 y)...more
is 1/25 of Time since earliest wheeled vehicles (4,000 y)...more
is 1/20 of Time since the start of the Iron Age (3,200 y)...more
is 2/5 of Time since the death of Shakespeare (404 y)...more
is about as big as Period of Neptune's orbit (164.8 y)...more
is about as big as Time since the publication of Dickens's Tale of Two Cities (163 y)...more
is 2 x Lifespan of human being (80 y)...more
is 4 x Time since first IBM Personal Computer launched (41 y)...more

If this was a standard unit ...