Time since the birth of Toscanelli

Time since the birth of Toscanelli (627 y)

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Time since the birth of Toscanelli (627 y)

is 1/400 of Time since the first modern humans (250,000 y)...more
is 1/4 of Time since the birth of Socrates (2,490 y)...more
is 1/4 of Time since start of building of the Parthenon (2,468 y)...more
is 1/2 of Time since the birth of al-Khwarizmi (1,246 y)...more
is 2 x Time since the birth of Euler (316 y)...more
is 2.5 x Time since birth of Sophie Germain (248 y)...more
is 2.5 x Period of Pluto's orbit (248 y)...more
is 2.5 x Time since the birth of Gauss (247 y)...more
is 4 x Time since the publication of Volume 1 of Marx's Das Kapital (157 y)...more
is 4 x Time since the birth of physicist Marie Curie (157 y)...more
is 5 x Time since birth of M. C. Escher (126 y)...more
is 5 x Time since first transatlantic wireless communication (123 y)...more
is 10 x Time since first human went into space (62 y)...more
is 25 x One average human generation (25 y)...more

If this was a standard unit ...