Time since the building of Great Wall of China

Time since the building of Great Wall of China (1,800 y)

/fact/time-since-the-building-of-great-wall-of-china

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Time since the building of Great Wall of China (1,800 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 birth of Diophantus (1,814 y)...more
is 2 x Time since building of Angkor Wat (905 y)...more
is 2 x Time since the birth of Ibn Rushd (Averroes) (898 y)...more
is 4 x Time since the birth of Galileo (457 y)...more
is 10 x Time since the birth of Cantor (179 y)...more

If this was a standard unit ...