Time since the first iron steamship crossed the English Channel

Time since the first iron steamship crossed the English Channel (196 y)

/fact/time-since-the-first-iron-steamship-crossed-the-english-channel

Link

Neat Ratios ...

Time since the first iron steamship crossed the English Channel (196 y)

is 1/10 of Time since start of building of the Colosseum (1,944 y)...more
is 1/5 of Time since the birth of Omar Khayyam (970 y)...more
is about as big as Time since the first passenger steam railway service (193 y)...more
is 4 x Time since the first man walked on the moon (49 y)...more

If this was a standard unit ...