今天，我们的太阳到达了它在地球天空中的最北点-至点。
Today, our sun reaches its northernmost point in planet Earth's sky.
形式定义就是,它在点P的重力势能,等于我，将物体从无穷远处,移动至点P所做的功。
The formal definition is that the gravitational potential energy at a point P is the work that I, Walter Lewin, have to do to bring that mass from infinity to that point P.
麦凯南夫妇继续讲道，“由于冬至点在不断推移，它将逐渐接近黄道面上的一点，在这一点，银心将黯然失色。”
The McKennas continued, "Because the winter solstice node is precessing, it is moving closer and closer to the point on the ecliptic where it will eclipse the galactic center."
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