Time since the death of Shakespeare

Time since the death of Shakespeare (403 y)

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Neat Ratios ...

Time since the death of Shakespeare (403 y)

is 1/10 of Time since earliest wheeled vehicles (4,000 y)...more
is 1/5 of Time since the birth of Hero of Alexandria (2,011 y)...more
is 2/5 of Time since start of building of Great Zimbabwe (1,000 y)...more
is 2 x Time since the birth of mathematician Maria Gaetana Agnesi (203 y)...more
is 2 x Time since the first iron steamship crossed the English Channel (199 y)...more
is 2.5 x Time since the publication of Dickens's Tale of Two Cities (162 y)...more
is 2.5 x Time since the publication of Darwin's On the Origin of Species (162 y)...more
is 4 x Time since the birth of chemist Rosalind Franklin (101 y)...more
is 5 x Lifespan of human being (80 y)...more
is 10 x Time since first IBM Personal Computer launched (40 y)...more
is 200 x Lifespan of rat (2 y)...more
is 400 x Period of Earth's orbit (1 y)...more

If this was a standard unit ...