Time since the birth of Diophantus

Time since the birth of Diophantus (1,812 y)

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Time since the birth of Diophantus (1,812 y)

is 2/5 of Time since building of the Great Pyramid of Giza / Cheops / Khufu (4,580 y)...more
is about as big as Time since the building of Great Wall of China (1,800 y)...more
is 2 x Time since building of Angkor Wat (903 y)...more
is 2 x Time since the birth of Ibn Rushd (Averroes) (896 y)...more
is 4 x Time since the birth of Shakespeare (458 y)...more
is 4 x Time since the birth of Galileo (457 y)...more
is 40 x Time since Concorde Supersonic Airliner entered service (46 y)...more
is 40 x Time since first Apple ][ computer launched (45 y)...more
is 400 x Period of Ceres's orbit (4.6 y)...more

If this was a standard unit ...