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Luchevaya skorost'
Proekciya vektora skorosti ob'ekta na luch zreniya nablyudatelya; ee schitayut polozhitel'noi, esli ob'ekt udalyaetsya ot nablyudatelya, i otricatel'noi - esli priblizhaetsya. Naprimer, izmeryaya smeshenie linii v spektrah nebesnyh tel, astronomy opredelyayut ih priblizhenie ili udalenie (effekt Doplera), t.e. izmeryayut komponent skorosti, napravlennyi po "luchu zreniya". Neredko luchevuyu skorost' nazyvayut radial'noi skorost'yu.Surdin V.G., GAISh, Moskva
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luchevaya skorost'
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