Period of Neptune's orbit

Period of Neptune's orbit (164.8 y)

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Neat Ratios ...

Period of Neptune's orbit (164.8 y)

is 1/250 of Age of oldest musical instrument (42,000 y)...more
is 1/40 of Age of the earliest city (6,500 y)...more
is 1/10 of Time since the birth of mathematician Hypatia (1,672 y)...more
is 2/5 of Duration of Dutch Empire (407 y)...more
is 2/5 of Time since the death of Shakespeare (404 y)...more
is 1/2 of Time since the publication of Isaac Newton's major work, the Principia (335 y)...more
is 1/2 of Duration of Mughal Empire (332 y)...more
is about as big as Time since the publication of Dickens's Tale of Two Cities (163 y)...more
is about as big as Time since the publication of Darwin's On the Origin of Species (163 y)...more
is 2 x Period of Uranus's orbit (84 y)...more
is 2 x Time since the first Volkswagen Beetle produced (84 y)...more
is 2 x Length of the Punic Wars (Rome v Carthage) (82 y)...more
is 2 x Length of reign of King Sobhuza II of Swaziland (82 y)...more
is 4 x Time since first IBM Personal Computer launched (41 y)...more

If this was a standard unit ...