English Dictionary

almucantar

IPA（発音記号）

/ælməˈkæntə/

名詞

(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.

日本語の意味

天球上の小さな円で、地平線と平行に位置し、天文や航法で星やその他の天体の高度を示すために用いられる

The navigator carefully measured the star's altitude using an almucantar drawn on his chart.

航海士は、星の高度を示すために用いられる、地平線と平行な天球上の小円をチャートに描き、それを使って星の高度を注意深く測定した。

意味（1）

(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.

VPon thys forſayde plate ben compaſed certayne cercles, that hyghten almicanteras : of whyche ſome of hem ſemen parfyte cercles, and ſome ſemen imparfyte. Upon this aforementioned plate are compassed certain circles that are called almucantars, of which some seem like perfect circles and some seem imperfect.]

意味（2）

(astronomy, archaic or historical) An instrument for observing the heavenly bodies as they cross such a circle.

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.

almucantars （ plural ）