almucantar

名词 n.
中文释义
英 /ælməˈkæntə/    美 /ælməˈkæntɚ/

英文释义

名词 n.
  1. 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. archaic,historical
    — Almucantars, or parallels of altitude, are circles parallel to the horizon, or whose poles are the zenith and nadir. All the points of any one almucantar are at equal altitudes above the horizon.
  2. An instrument for observing the heavenly bodies as they cross such a circle. archaic,historical
    — A wide field of work appears open in the application of photography to meridian instruments, or to the almucantar. The sensitive plate should be substituted for the reticule, and the position marked by a graver attached to the tail-piece of the telescope.

词形变化

almucantars plural almacantar alternative almicantar alternative almucanter alternative

词汇关系

衍生词
almucantar staff

词源

From Middle English almicanteras, French almicantarat, almucantarat, from Medieval Latin almicantarath, almucantarath, from Arabic المقنطرات (almuqanṭarāt, “circles of celestial latitude”), from قَنْطَرَة (qanṭara, “arch”).
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