Time since start of building of Great Zimbabwe

Time since start of building of Great Zimbabwe (1,000 y)

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Neat Ratios ...

Time since start of building of Great Zimbabwe (1,000 y)

is 1/250 of Time since the first modern humans (250,000 y)...more
is 1/50 of Time since first humans in Australia (50,000 y)...more
is 1/4 of Time since earliest wheeled vehicles (4,000 y)...more
is 2/5 of Time since the birth of Socrates (2,490 y)...more
is 2/5 of Time since start of building of the Parthenon (2,466 y)...more
is 1/2 of Time since the birth of Hero of Alexandria (2,012 y)...more
is 2.5 x Time since the death of Shakespeare (404 y)...more
is 4 x Time since the birth of Joseph Fourier (254 y)...more
is 4 x Period of Pluto's orbit (248 y)...more
is 4 x Time since birth of Sophie Germain (246 y)...more
is 5 x Time since the first iron steamship crossed the English Channel (200 y)...more
is 5 x Time since the first passenger steam railway service (197 y)...more
is 40 x One average human generation (25 y)...more
is 100 x Time since first Tesla Model S launched (10 y)...more
is 500 x Lifespan of rat (2 y)...more
is 1000 x Period of Earth's orbit (1 y)...more

If this was a standard unit ...