Octant - Hachibungi
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An astronomical instrument used to measure the altitude of celestial bodies and determine the position of a ship. It has a structure similar to a sextant, but uses 1/8 (45°) of a circumference instead of 1/6. It was invented by J. Hadley of England and can measure the angular distance between two points on the celestial sphere, but has been superseded by more sophisticated sextants. Source : Heibonsha Encyclopedia About MyPedia Information |
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天体の高度を観測して船の位置を知るための天文測器。六分儀と同様の構造をもつが，円周の1/6でなく1/8（45°）を用いる。英国のJ.ハドリーが考案，天球上の二点間の角距離を測ることができるが，より精巧な六分儀にとってかわられた。
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