By this , the error of observation will be reduced . the precision requirement of angles measurement is 0 . 1 arc second . angles measurement can be substituted by translation measurement between images in detectors 根据观测精度的要求这一夹角的测量精度必须控制在0 . 1角秒内，夹角测量可转化为探测器上图像平移量测量。
The magnification of any telescope can be changed very easily by changing the eyepiece . even for the largest telescopes , the magnification is seldom over 500 , usually between 100 - 200 . thus , large telescopes do not magnify more , they only show brighter and sharper images 其实大望远镜并不是把天体放得更大，而只是提供一个较光和较清晰的影像罢了倍率是物体视大小的放大比率，例如一个原本视角直径为1角秒的物体，若放大后的视大小为30角秒，那么倍率便是30倍。
The sub - arcsecond spatial resolution of chandra , and xmm - newton s unrivaled sensitivity open a new area for the study of nearby galaxies ; many x - ray point sources are resolved without confusion and astronomers can study their x - ray properties such as timing behaviors and spectra in details 钱德拉射线天文台具备低于一角秒的分辨率，而xmm -牛顿卫星的灵敏度更是无出其右，二者天衣无缝的配合，为研究这些天体的射线特性，例如光度变化和光谱等，开创一个全新的领域。
It is demonstrated that the solution for 141 000 order normal equations for a simulated astro - geodetic network ( 47 057 points ) and a space one ( 476 points ) iterates 4 993 times to converge to 1 10 - 18 second , taking 28 min and 47 seconds , on a pii / 233 computer , showing over 40 times more efficiency , as compared with the coefficients unadjusted 利用模拟的天文大地网( 47057点)和空间网( 476点)在pii / 233微机上解算14 . 1万阶方程组共迭代4993次(收敛至1 10 - 18角秒) ，花费机时28分47秒，与未进行系数调整相比，功效提高40多倍。
