Megametre

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**1 megametre** =
SI units
1,000.00 km	1.000×10⁶ m
Astronomical units
6.685×10⁻⁶ AU	105.7×10⁻¹² ly
US customary / Imperial units
621.37 mi	3.281×10⁶ ft

A megametre (American spelling: megameter, symbol Mm) is a unit of length in the metric system, equal to one million metres, the SI base unit of length, hence to 1,000 km or approximately 621.37 miles.

Megametres (from the Greek words megas = big and metro = count/measure) are rarely seen in practical use, because they are too big for most terrestrial tasks. Their symbol (Mm) can also be confused with millimetres (mm). Still there are a number of "megametre fans".^{[citation needed]} Megametres are also occasionally found in science fiction.^{[citation needed]}

The Earth's polar circumference is 39.94 Mm. (It was exactly 40 Mm from 1791 to 1875; see metre).
The distance from Amsterdam to Marseille is approximately 1 Mm.
The Earth's equatorial diameter is 12.76 Mm.
The mean distance from the Earth to the Moon is 384.4 Mm.
Jupiter's equatorial diameter is 143 Mm.
Quebec province's total area is 1.542 Mm².

Megametre

See also