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中星儀
释义
中星儀
zhōng xīng yí
观测恒星通过子午圈的时刻，以确定时钟改正值的天体测量仪器。基本构造为一具置于东西方向水平轴上，能自由旋转的望远镜。望远镜的视准轴必须与水平轴正交，视线方向恰在子午面内仰俯。据此观测到的恒星通过子午圈的时刻，即为当地的恒星时，与地方恒星时时钟读数比对，即可得到时钟改正值。
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flatend
flat end
flat-end
flat end coverings
flat end difference
flat-ended
flat-ended cathode-ray tube
flat ended chisel
flatended horizontal cylindrical
flat ended horizontal cylindrical
flat-ended horizontal cylindrical
flatended horizontal cylindrical drum
flat ended horizontal cylindrical drum
flat-ended horizontal cylindrical drum
flat-ended horizontal cylindrical tank
flat-ended indentation test
flat-ended projectile
flat-ended projectiles
flat ended root canal reamer
flat-ended root canal reamer
flat-ended tube
flat end fissure bur
flat-end fissure bur
flat end milling machine
flat end mills
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更新时间：2025/5/30 22:35:52