The second law, the law of areas, states that a line connecting a planet to the sun covers an equal area over equal periods of time.
开普勒第二定律，也即面积定律，指出从太阳到行星所联接的直线在相等时间内扫过同等的面积。
What is important is that the two points have the same second coordinate - the line connecting them is horizontal.
重要的是这两个点的第二个坐标相同——它们之间的连线是水平的。
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