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."
它角色中最重要的部分，就是与你们宇宙的中枢太阳有一个强力的联合，2012的冬至点会让你们了解这一点。
It will play its most important part when there is a powerful alignment with the Central Sun of your Universe, and you know this as your Winter Solstice of 2012.
这次日食只属于多一点半从零摄氏度癌症，冬至点的程度。
This eclipse falls only a little more than one-half degree from zero degrees Cancer, the solstice point.
每年的二至点和二分点总会发生一些变化因为地球正改变着相对于绕日轨道面的自转轴角度。
From year to year, there is always some variability in the equinoxes and solstices because of the way Earth's changing tilt matches up with its orbit around the sun.
日地系统的另一个特点是二分点和二至点沿轨道逐渐运动。
Another characteristic of the sun-earth system is the gradual procession of the equinoxes and solstices along the orbit.
日地系统的另一个特点是二分点和二至点沿轨道逐渐运动。
Another characteristic of the sun-earth system is the gradual procession of the equinoxes and solstices along the orbit.
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