| 1. | As a natural limit for angular resolution, one may take the angular size of the central diffraction disk .
我们可以取中心衍射环的角直径作为角分辨率的一种自然极限。 |
| 2. | The combination of very large radio flux and exceedingly small angular size means that the sources have a fantastic surface brightness .
极大的射电流量同极小的角经集于一身，意味着这些发射源有难以置信的高表面亮度。 |
| 3. | The intervening matter between the source and the observer gravitationally deflects and focuses the light bundle, increasing the apparent angular size of the source .
光源与观测者之间的物质对光束产生引力偏折和聚焦作用，使光源的视角径加大。 |
| 4. | The angular size of the moon viewed from the earth is about 0 . 5
从地球看来，月球的视直径即月面最远两点的角距约为0 . 5度。 |
| 5. | Thus , we can use our hands to measure roughly the angular sizes of various objects
换句话说，我们可以用自己的手作量角器，量度天体的大小或距离。 |
| 6. | Since the distance between the moon and the earth is not constant , the angular size of the moon can have a small variation
由于地球和月球的距离并不固定，所以在地球看来，月球的角大小亦会出现变化。 |
| 7. | The angular size , measured in degrees or arc seconds , which is very important in astronomy , is not commonly used in everyday life
我们亦会介绍一个天文学上非常重要，但日常生活很少接触到的概念角距和角大小。 |
| 8. | It could happen that the moon is at the right position , but its angular size is too small to cover the whole sun . hence , there will be an
有时，月球虽然处于能造成日食的位置，但由于月球的角大小不足以掩盖整个太阳，便会出现 |
| 9. | During solar eclipse , if the angular size of the moon is larger than that of the sun , the sun will be totally covered , resulted in total solar eclipse
日食solar eclipse时太阳被月球所侵蚀与及月食lunar eclipse时月球被地影所蚕食的意思亦显而易见。 |
| 10. | At arm s length , the angular size of our fists is about 10 , fingers is about 1 and the tip of the thumb to the tip of the little finger of an extended hand is about 20
将手伸直后，拳头的角大小约为10度，手指约为1度，若把手掌张开，由拇指尖至小指尖的角距则约为20度。 |
