Astronomy Tips and Accessories
PARSEC (abbrv. pc) - A parsec is the distance at which 1 AU subtends an angle of 1 arcsec. Approximately 3.26 light years. Or rather, a right triangle where the length of the leg "α" (the Earth and Sun distance of 1AU) and the length of the leg "b", create a hypotenuse that is a one degree arc between "c" and "b". See previous image above of our closest star Proxima Centauri for a scale representation of a parsec.
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PI = 3.14159265358979323846264338327950288419716939937510...