Light year, Length

A light-year or lightyear, symbol ly, is a unit of length. A common misconception is that a light-year is a unit of time, which is incorrect. A light-year is the distance light travels in vacuum in one Julian year. Read more >>

I want to convert:

Metric

Kilometre
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Metre
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Decimetre
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Centimetre
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Millimetre
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Micrometre
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Nanometre
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Angstrom
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British/American

League
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Mile
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Furlong
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Chain
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Rod
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Yard
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Foot
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Link
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Hand
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Inch
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Line
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Mil
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Thou
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Nautical

Sea mile
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Fathom
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Astronomical

Parsec
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Light year
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Astronomical unit
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Light minute
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Light second
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In general English usage, length (symbols: l, L) is one particular instance of distance: an object's length is its extent along its longest dimension. This is to be contrasted with height, denoting vertical extent, and width (or breadth), denoting a lateral extent along a dimension shorter than an object's length. In the physical sciences and engineering, the word "length" is typically used synonymously with "distance". Read more >>