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(iii) Parsec : One parsec is the distance from where
the semi major axis of orbit of earth (1 A.U.) subtends an angle of one second.
i.e., 1 Parsec x 1" = 1 A.U
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The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical ... A parsec is obtained by the use of parallax and trigonometry, and is defined as ... angle, from that star's perspective, of the semimajor axis of the Earth's orbit. ... He proposed the name astron, but mentioned that Carl Charlier had ...
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