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How long is 37.5 milimeters?

It's about 0.0000000010 times as long as The Circumfrence of Earth
The length of The Circumfrence of Earth is about 40,075,014,000 milimeters.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 40,075,014,000 milimeters. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about 0.00000000010 times as long as The Distance from Earth to the Moon
The length of The Distance from Earth to the Moon is about 384,436,500,000 milimeters.
(a.k.a. Luna) (median of semi-major axis, or apigee, and semi-minor axes, or perigee)
The orbit of the Moon around the Earth is elliptical, with an average distance of 384,436,500,000 milimeters from center-to-center. About 428.376 kg of moon rock have been cataloged on the Earth, from the American Apollo and Soviet Luna Programs, and from samples that have been extracted from meteorites.
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