Last modified on 9th August 2000.

Encyclopædia Galactica

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The measure of distance used by professional astronomers. It is defined as the distance at which one AU would look one arc second wide. One parsec is therefore about 31,000 billion km (19,180 billion miles), or 3.2616 light years, or 206,265 AU.

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Created by Rami T. F. Rekola