# Kilometre/Related Articles

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*See also changes related to Kilometre, or pages that link to Kilometre or to this page or whose text contains "Kilometre".*

## Parent topics

- Unit [r]:
*Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Unit (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.* - Length [r]:
*Add brief definition or description* - Metre (unit) [r]: Unit of length; one of the seven SI base units.
^{[e]}

## Subtopics

- International System of Units [r]: Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela.
^{[e]} - Mile [r]: A non-SI unit of length, equal to 1.609 kilometres, and equivalent to 5,280 feet.
^{[e]} - Nautical mile [r]: Unit of distance approximately equal to one minute of arc of latitude, now defined as being exactly 1852 metres.
^{[e]} - Light year [r]: Distance that light travels in vacuum in one year; 9,460,730,472,580.800 km = 9.4607304 * 10
^{12}km.^{[e]} - Astronomical unit [r]:
*Add brief definition or description* - Speed of light [r]: A physical constant
*c*describing the speed of electromagnetic radiation in vacuum. In the International System of Units the metre is the distance light travels in classical vacuum in 1/*c*seconds, using the defined value*c = c*≡ 299 792 458 m/s (exact)._{0}^{[e]}