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浑仪是我国现存的古代天文仪器之一。是早在汉武帝时(公元前140——86年)洛下闳就制造出来的,后来经过后汉的张衡(公元78——139年)作了更完善的改进。浑仪共八圈,外层有三个不动的圈:地平圈、子午圈和赤道圈,中层有四个连在一起,可以一齐转动的圈:二分圈.二至圈,游旋赤道圈和黄道圈,内层有一个可转动的回游圈,附有一条窥管。这个仪器可以测出天体的三种坐标:地平经度和地平纬度,赤经和赤纬、黄经和黄纬。汉代以来,历代掌理天家的官吏,都以浑仪为主要的观测仪器。现存的这个浑仪,
Puyi is one of the existing ancient astronomical instruments in China. It was created as early as Han Wudi (140-86 BC), and was later refined by Zhang Heng (AD 78-139). Puyi has a total of eight laps. There are three immovable circles on the outer layer: the ground circle, the meridian circle, and the equator circle. There are four circles in the middle that can be connected together and can be turned together: two-circle circle, two-to-two circle, the circling equator and the ecliptic. In the circle, there is a rotating travel circle in the inner layer with a peep tube. The instrument can measure the three coordinates of the celestial body: the longitude of the horizon and the latitude of the horizon, the right and right declination, the longitude and the yellow latitude. Since the Han dynasty, the official residences of the Tang dynasty have used Puyi as the main observation instrument. The existing Puyi,