Galactic Year (period of rotation of the Milky Way galaxy)

Galactic Year (period of rotation of the Milky Way galaxy) (225 million y)

/fact/galactic-year-period-of-rotation-of-the-milky-way-galaxy

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Galactic Year (period of rotation of the Milky Way galaxy) (225 million y)

is 1/20 of Age of the Earth (4.54 billion y)...more
is 1/2 of Time since the end of the Ordovician geologic period (444 million y)...more

If this was a standard unit ...