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We found 4 dictionaries with English definitions that include the word right ascensions:
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General dictionaries General (4 matching dictionaries)
  1. right ascensions: Merriam-Webster.com [home, info]
  2. right ascensions: Collins English Dictionary [home, info]
  3. right ascensions: Vocabulary.com [home, info]
  4. right ascensions: Wiktionary [home, info]

(Note: See right_ascension for more definitions.)

Quick definitions from WordNet (right ascension)

noun:  an arc of the celestial equator eastward from the vernal equinox
noun:  (astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere ("One hour of right ascension equals fifteen degrees")

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