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百家乐真人官方网站首页|双语科技百科(天文) 第13期:简仪
时间:2020-10-13 来源:百家乐真人官方网站首页 浏览量 37457 次

百家乐真人官方网站首页-Abridged Armilla简仪The Abridged or simplified Armilla was invented in 1276 by Guo Shoujing (1231一1316),an astronomer in the Yuan Dynasty(1271一1368),for measuring positions of celestial bodies.简仪为元代(1271一1368)天文学家郭守敬(1231一1316)于公元1276年脱胎的一种测量天体方位的仪器。The apparatus is simpler than the armillay sphere in terms of structure and application,and it gives a panorama of the celes-tial sphere except the part around Polaris,so it is called Abridged Armilla.该仪器的结构和用于都比浑仪非常简单,而且除北极星附近以外,整个天空一览无余,故称简仪。The primary structure of Abridged Armilla contains two large rings that are per-pendicular to each other, of which one is parallel with the equatorial plane and is accordingly called“equatorial ring;,简仪的主要装置是由两个相互横向的大圆环构成,其中的一个环面平行于地球赤道面,叫作“赤道的环”;and the other is a double-ring which is per-pendicular to the center of the equatorial ring,revolving around a metallic shaft,and is called“right ascension double-ring.另一个是粗壮在赤道的环中心的双环,能绕一根金属轴旋转,叫作“赤经双环”。

The double-ring holds within itself a sighting tube with crosshairs,which equals to a monocular and revolves around the center of the right ascension double-ring.双环中间垫着一根装有十字丝装置的窥管,相等于单镜筒望远镜,能绕赤经双环的中心旋转。During observation,the sighting tube is targeted at a certain star, thus the positional value can be read out at the dials of the equatorial ring and the right ascension double-ring.观测时,将窥管对准某颗待测星,然后在赤道环和赤经双环的刻度盘上必要朗读这颗星星的方位值。

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Two stands are supportingthe metallic shaft that exactly directs at the south and the north,bracing the entire observing unit to a position in which the north part is higher than the south part.有两个支架纳着于是以南北方向的金属轴,承托着整个观测装置,使这个装置维持着北高南较低的形状。The equatorial mounting,invented by the Chinese,was somewhat 500 years earli-er than like devices createdin Europe这是我国首先发明者的赤道装置,要比欧洲人用于的赤道装置早500年左右。。

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