Time since the earliest writing

Time since the earliest writing (5,100 y)

/fact/time-since-the-earliest-writing

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Neat Ratios ...

Time since the earliest writing (5,100 y)

is 1/500 of Age of earliest stone hand axe (2.6 million y)...more
is 1/500 of Time since the end of the Neogene geologic period (2.58 million y)...more
is 1/50 of Time since the first modern humans (250,000 y)...more
is 1/10 of Time since first humans in Australia (50,000 y)...more
is about as big as Age of oldest wooden wheel (5,150 y)...more
is about as big as Time since building of Stonehenge (5,120 y)...more
is 2 x Time since the birth of Pythagoras (2,594 y)...more
is 2.5 x Time since the birth of Hero of Alexandria (2,014 y)...more
is 5 x Time since start of building of Great Zimbabwe (1,000 y)...more
is 20 x Time since the birth of Joseph Fourier (256 y)...more
is 25 x Time since the birth of mathematician Maria Gaetana Agnesi (206 y)...more
is 25 x Time since the first iron steamship crossed the English Channel (202 y)...more
is 40 x Time since birth of M. C. Escher (126 y)...more
is 50 x Time since the birth of chemist Rosalind Franklin (104 y)...more
is 200 x One average human generation (25 y)...more
is 500 x Time since first Tesla Model S launched (10 y)...more
is 2600 x Lifespan of rat (2 y)...more
is 5000 x Period of Earth's orbit (1 y)...more

If this was a standard unit ...