An observer may pass through the same plane as many of the falling ice crystals near sunrise or sunset.

观察者在接近日出或日落的时候可以与这些冰晶穿过同一个平面。

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If one day we can catch a plane to go to wherever we want to go, perhaps we could go to France and watch the sunset when the night is coming.

假如有一天，我们可以坐上飞机去到我们想去的地方，也许我们就可以去法国，观赏夜幕降临前的落日余晖。

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After sunset, the plane slowly glides to lower altitudes on the stored power until dawn, when the process starts again.

WSJ: A Solar-Powered Plane Travels Light | WSJ. Magazine May 2013