How was it determined that a parsec is 3.26 light years?
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One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. A parsec is equivalent to 3.26 light years it is not defined to be 3.26 light years and since a light years is the distance light travels in 1 years 9.4 trillion km, 1 parsec equal 30.8 trillions km
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