| 1. | Sub - arcsec radio astronomy
亚角秒射电天文学 |
| 2. | Micro - arcsec astrometry
微角秒天体测量 |
| 3. | If the angle p is one arc second , then we define the distance d to be one
当偏移的角度为一角秒，星体与地球的距离即为天文学上所定义的一 |
| 4. | By that time , the apparent diameter of mars will be as large as 25 . 1 arc seconds . shining at - 2 . 9 magnitude , it will become the brightest star in the night sky for weeks
那时火星视直径达25 . 1角秒，光度达- 2 . 9等，成为当时夜空中最光亮的星。 |
| 5. | Gassendi estimated mercury ' s apparent diameter to be about 20 arc seconds ? that is , about 1 / 180 of a degree ? which was in itself a considerable scientific advance
贾山迪估计水星的视直径大约是20角秒（约是1度的1 / 180 ） ，这本身就是一大科学进展。 |
| 6. | Unfortunately , the results from the 1761 transit were not as good as expected : the measured values of the solar parallax ranged from 8 . 3 to 10 . 6 arc seconds
不幸的是， 1761年凌日得到的观测结果并不如预期的好：测量到的太阳视差范围是8 . 3 ~ 10 . 6角秒。 |
| 7. | The note also provided columns of residuals of around one arcsecond , which adams listed to demonstrate that his theory was accounting for uranus ' s hitherto anomalous motion
亚当斯还列出了几行将近一角秒的残差，证明他的理论可以解释天王星直到当时都无法解释的脱序运动。 |
| 8. | To measure this angle reasonably well , gp - b needed a fantastic precision of 0 . 0005 arcseconds . it s like measuring the thickness of a sheet of paper held edge - on 160 km away
要准确量度这角度，重力探测器b要达到0 . 0005角秒的精确度，精度要求相等于要量度出160公里外一张纸张的厚度。 |
| 9. | Nasa s chandra x - ray observatory has changed this picture ; it provides the sub - arcsecond resolution equivalent to the spatial resolution of ground - based optical telescopes
这个天文台具备低于一角秒的分辨率，精确程度足以和地面光学望远镜媲美，解决了一直以来对应天体证认困难的问题。 |
| 10. | According to calculations , the twisted space - time around earth should cause the axes of the gyros to drift merely 0 . 041 arcseconds over a year . an arcsecond is 1 3600th of a degree
根据运算，地球周围扭曲的时空只会引致回转仪转轴每年漂移0 . 041角秒，一角秒为1度的3600分之一，可见程度之小。 |
