Time since the first iron steamship crossed the English Channel

Time since the first iron steamship crossed the English Channel (202 y)

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Time since the first iron steamship crossed the English Channel (202 y)

is 1/250 of Time since first humans in Australia (50,000 y)...more
is 1/25 of Age of oldest wooden wheel (5,150 y)...more
is 1/25 of Time since building of Stonehenge (5,120 y)...more
is 1/25 of Time since the earliest writing (5,100 y)...more
is 1/20 of Time since earliest wheeled vehicles (4,000 y)...more
is 1/10 of Time since the birth of Hero of Alexandria (2,014 y)...more
is 1/5 of Time since start of building of Great Zimbabwe (1,000 y)...more
is 1/2 of Time since the death of Shakespeare (406 y)...more
is about as big as Time since the birth of mathematician Maria Gaetana Agnesi (206 y)...more
is about as big as Time since the first passenger steam railway service (199 y)...more
is 2.5 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more
is 2.5 x Lifespan of human being (80 y)...more
is 5 x Time since first Apple Macintosh Computer launched (40 y)...more
is 20 x Time since first Tesla Model S launched (10 y)...more
is 100 x Lifespan of rat (2 y)...more
is 200 x Period of Earth's orbit (1 y)...more

If this was a standard unit ...