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CIDE DICTIONARY
paralithodes | paralithodes camtschatica | parallactic | parallactical | parallax | parallax second | parallel | parallel bars | parallel circuit | parallel interface | parallel lives

parallax second

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CIDE DICTIONARY

parallax secondn. 
     An annual parallax of one second of an arc; -- applied to celestial objects outside the solar system. It is used to measure the distance of an astronomical object from the Earth. A star which has an annual parallax of one second of an arc is considered to be one parsec (3.26 light years) distant from the earth. See parsec in the vocabulary.  [PJC]

For further exploring for "parallax second" in Webster Dictionary Online


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