apparent diameter meaning in English
虚表直径, 视直径
虚表直径，视直径
Examples
- 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。