proper motion

proper motion
noun Astronomy the part of the apparent motion of a star due to its actual movement in space relative to the sun.

English new terms dictionary. 2014.

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  • Proper motion — The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system.[1] It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree.[2] This contrasts with… …   Wikipedia

  • proper motion — Astron. the angular motion of a star relative to a suitably defined frame of reference, expressed in seconds of arc per year. Cf. tangential motion. [1595 1605] * * * Apparent motion of a star across the celestial sphere at right angles to the… …   Universalium

  • proper motion — savasis judėjimas statusas T sritis fizika atitikmenys: angl. proper motion vok. Eigenbewegung, f rus. собственное движение, n pranc. mouvement propre, m …   Fizikos terminų žodynas

  • proper motion — noun : the apparent change in position of a star usually expressed in seconds of arc per year that results from the projection on the celestial sphere of its motion with respect to the solar system see tangential motion …   Useful english dictionary

  • proper motion — /prɒpə ˈmoʊʃən/ (say propuh mohshuhn) noun the component of a star s motion in space which is perpendicular to the line of sight …  

  • proper motion — noun The change in apparent position of a celestial body due to that bodys velocity relative to the Sun …   Wiktionary

  • Motion — Mo tion, n. [F., fr. L. motio, fr. movere, motum, to move. See {Move}.] 1. The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary; opposed… …   The Collaborative International Dictionary of English

  • Motion block — Motion Mo tion, n. [F., fr. L. motio, fr. movere, motum, to move. See {Move}.] 1. The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary;… …   The Collaborative International Dictionary of English

  • proper — early 13c., adapted to some purpose, fit, apt, from O.Fr. propre (11c.), from L. proprius one s own, particular to itself, from pro privo for the individual. Proper name belonging to or relating to the person or thing in question, is from late… …   Etymology dictionary

  • proper — adj., adv., & n. adj. 1 a accurate, correct (in the proper sense of the word; gave him the proper amount). b fit, suitable, right (at the proper time; do it the proper way). 2 decent; respectable, esp. excessively so (not quite proper). 3 (usu.… …   Useful english dictionary

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