在拂晓之前，英仙座流星雨的辐射点—英仙座将上升至我们头顶的天空的顶端。
Before dawn, Perseus - radiant point of the Perseid meteor shower - is close to overhead.
每年的流星雨主要来自彗星，而辐射点就是与彗星轨道相交的那个点，就好像列车轨道在远处聚合的那点一样。
Meteors in annual showers stem from comets, and the radiant point is the point in the sky where we cross the comet's orbit. It's kind of like the point in the distance where train tracks converge.
因此，当地球靠近这段轨道时，从辐射点落下的碎片就形成了英仙座流星雨。
Therefore, when Earth crosses this orbit, the radiant point of falling debris appears in Perseus.
但是我们提议你乐意了解今晚流星雨的辐射源在哪个位置，这样你就能在没有月光阻碍的夜空，想像流星雨是从这个点倾泻下来。
But we thought you'd enjoy knowing where the radiant is tonight, so you can imagine the meteors pouring from this point in the sky, in a sky totally free of moonlit glare!
重点叙述流星天文学的历史与现状；流星群的地面和空间观测；流星雨观测和理论辐射点；
Especially, the history and status of meteoroid astronomy, the ground-based and space observations of meteoroid streams, the observed and theoretical radiants about meteor showers;
重点叙述流星天文学的历史与现状；流星群的地面和空间观测；流星雨观测和理论辐射点；
Especially, the history and status of meteoroid astronomy, the ground-based and space observations of meteoroid streams, the observed and theoretical radiants about meteor showers;
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