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Click here for Wookieepedia's article on the Canon version of this subject.  This article covers the Legends version of this subject. 
For other uses, see LY.

A light-year, or light year, also abbreviated ly, was the distance light traveled in vacuum in one Galactic Standard Year. 3.258 light years made up a parsec, which was a unit of distance that was important in locating star systems in the known galaxy.[2]

Since the Galactic Standard Calendar year was 368 days, a Galactic Standard Light Year would have been 9,531,961,160,601,600 meters.

Behind the scenes[]

The above calculation assumes that the Galactic Standard Day, Hour, etc. and Meter are equal to Earth's, and results in an in-universe light year 0.75% longer than the real-world one.

It is also possible that Galactic days (and hours etc.) were 0.75% shorter than their Earth equivalents, and that the light years are the same length. (see below)

The length of a light year depends on the exact length of one year. On Earth, the International Astronomical Union (IAU) uses a Julian year of 365.25 days, while other sources may use a Gregorian year of 365.2425 days, or another year altogether.

Source year (days) light year (meter) light year (miles)
IAU 365.25 9,460,730,472,580,800 5,878,625,373,184
Gregorian 365.2425 9,460,536,207,068,020 5,878,504,662,190
Google 365.242199 9.460 528 4 ×1015 5.878 499 81 ×1012
Yahoo 365.2411 9.460 5 ×1015 5,878,482,164,161
Coruscant 368 9,531,961,160,601,600 5,922,886,070,723

While Yahoo separately reports a year length of 365.24220 days, its rounding of the light year length to five digits results in a year length of ~365.2411 days.

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