A light-year is the distance travelled by light in one year. An Earth-based light-year is 9.461x1015m. However this is not appropriate in a STAR WARS context, because the galactic standard year is derived from the orbital period of Coruscant rather than Earth. As stated below in the time section, the standard year is slightly longer than the terrestrial equivalent. We assume that the standard second exactly equals the usual metric second. Therefore when a citizen of the Old Republic, Galactic Empire or New Republic quotes a distance in "light-years", the unit is actually 368/365.25 times our version of the light-year. (It is about 0.75% greater.) By the Coruscant definition, a light-year is approximately 9.531x1015m. In Shield of Lies, Lando Calrissian states that the galaxy is 120,000ly in diameter.
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m km ly pc
m 1 0.001 1.049x10-16 3.240x10-17/a
km 1000 1 1.049x10-13 3.240x10-14/a
ly 9.531x1015 9.531x1012 1 0.3088/a
pc 3.086x1016a 3.086x1013a 3.238a 1
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The value a=(Coruscant orbit semimajor axis)/(Earth orbit semimajor axis) is assumed to equal 1.
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