Unit Definition (megaparsec) The parsec (symbol pc) is a unit of length used in astronomy. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles.
Unit Definition (polegada [Portuguese]) The polegada is a Portuguese "inch" unit, equal to 1/12 pé, 2.777 centimeters, or 1.093 inches.
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