reflecting circle
(mineralogy) Having a lustre like that of metal, but duller and less reflective
An astronomical instrument for measuring angles, like the sextant or Hadley's quadrant, by the reflection of light from two plane mirrors which it carries, and differing from the sextant chiefly in having an entire circle.
Third-person singular simple present indicative form of postcede
plural of epineural
航海士は夜明けに緯度を測る前に、二枚の平面鏡で光を反射して角度を測定する全円反射器を慎重に校正した。
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