Time since the birth of Leonardo da Vinci

Time since the birth of Leonardo da Vinci (572 y)

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Neat Ratios ...

Time since the birth of Leonardo da Vinci (572 y)

is 1/20 of Time since the earliest farming (11,500 y)...more
is 1/4 of Time since the birth of Archimedes (2,300 y)...more
is 1/4 of Time since the birth of Eratosthenes (2,299 y)...more
is 1/4 of Time since start of building of the Great Pyramid of Cholula (2,250 y)...more
is 4 x Time since the birth of Einstein (145 y)...more
is 4 x Time since birth of Emmy Noether (142 y)...more
is 5 x Time since first Model T Ford launched (116 y)...more
is 5 x Time since the birth of chemist Dorothy Hodgkin (114 y)...more

If this was a standard unit ...