Time since the birth of Euler

Time since the birth of Euler (316 y)

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Neat Ratios ...

Time since the birth of Euler (316 y)

is 1/10 of Time since the start of the Iron Age (3,200 y)...more
is 1/4 of Time since the birth of al-Khwarizmi (1,246 y)...more
is 1/2 of Time since the birth of Toscanelli (627 y)...more
is 2 x Time since the publication of Volume 1 of Marx's Das Kapital (157 y)...more
is 2 x Time since the birth of physicist Marie Curie (157 y)...more
is 2.5 x Time since birth of M. C. Escher (126 y)...more
is 4 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more
is 4 x Lifespan of human being (80 y)...more
is 5 x Time since first human went into space (62 y)...more

If this was a standard unit ...