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Parsec - Wikipedia s to 7005648000000000000♠648000/π astronomical units. One parsec is equal to about 3.26 light-years (30 trillion km or 19 trillion miles) in length. The nearest star, Proxima Centauri, is about 1.3 parsecs (4.2 light-years) from the Sun. [2] <span>Most of the stars visible to the unaided eye in the night sky are within 500 parsecs of the Sun. [citation needed]
The parsec unit was probably first suggested in 1913 by the British astronomer Herbert Hall Turner. [3] Named as a portmanteau of the parallax of one arcsecond, it was defined so as
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