GLH－130-20 航海六分儀
測量天體和水天線之間的夾角—天體觀測高度以及兩物標(biāo)之間的水平角和單一物標(biāo)高度的垂直角。
是精密的測角儀器，它由架體、光學(xué)系統(tǒng)和測角讀數(shù)裝置等三大部分組成。光學(xué)系統(tǒng)包括有望遠(yuǎn)鏡、動鏡、固定鏡和濾光片等；測角讀數(shù)裝置有分度弧、指、鼓形輪和游標(biāo)尺等。這些部件都安裝在架體上，并通過指將?光學(xué)系統(tǒng)和測角讀數(shù)裝置聯(lián)結(jié)成一整體。
A sextant is an instrument for measuring the angle between two objects by bringing into coincidence to the eye of the observer, rays of light received directly from one object and reflected from the other. Its principal use is to measure the altitudes of celestial bodies above the visible sea horizon. Available in various types. When ordering, specify escope （magnifying & lens diameter） and whether the sextant should be with or without illumination. Furnished with a wooden or plastic case
