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almucantar noun

  /ælməˈkæntə/ , /ælməˈkæntɚ/
  • (astronomy, archaic, or, historical) A small circle on the celestial sphere, parallel to the horizon, that is used in astronomy and navigation to show altitude of a star or any other heavenly body.
 almacantar, líne chomhthreomhar airde
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