| 1. | Inner planets also have both prograde and retrograde motions
内行星也有顺行和逆行。 |
| 2. | The phase of the moon , mercury , or venus when half of the disk is illuminated
内行星明亮的半圆月球、水星或金星其一半被照亮的现象 |
| 3. | Mercury and venus are inferior planets in the solar system as they are nearer to the sun than the earth
内行星凌日现象水星和金星是太阳系中的内行星，它们比地球更接近太阳。 |
| 4. | Figure 1 the relative positions of the sun , an inferior planet and the earth during the transit of the inferior planet
发生内行星凌日现象时，太阳、内行星及地球的相对位置。 |
| 5. | Conjunction may also occur between two planets , or between the moon and a planet or the moon and the sun
下合。除内行星外，行星与行星之间，行星和月球和太阳之间也有合的现象。 |
| 6. | When it precedes the sun , appearing west of the sun in the morning , it is in western elongation
。反之，在日出前见到的内行星正位于太阳的西面，若这时的距角是这段时间最大的，便称为 |
| 7. | The huge jupiter is like a cosmological vacuum cleaner , shielding inner planets from many impacts of external objects
巨大的木星彷佛宇宙吸尘机，保护内行星免受太多外来物体撞击。 nasa |
| 8. | Uranus , the first planet in our solar system discovered in modern times , was discovered by william herschel in 1781
天王星是现代历史记载上，首个被发现的太阳系内行星。它于1781年由赫歇尔发现。 |
| 9. | This phenomenon does not occur every year because of the inclination of the inferior planet s orbit to that of the earth ( figure 1 )
由于内行星围绕太阳公转的轨道与地球的轨道并不是在同一平面上，内行星凌日现象并不是每年都会发生( |
| 10. | If researchers can confirm that the lunar cataclysm did indeed occur , the discovery would have profound implications for the history of all the inner planets
如果研究人员能证实月球灾难确曾发生，这项发现便对所有内行星的历史深具意义。 |
