角秒 meaning in English
second of arc
Examples
- Sub - arcsec radio astronomy
亚角秒射电天文学 - Micro - arcsec astrometry
微角秒天体测量 - 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 - 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。 - 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。