1·Easy to spot in binoculars for now, McNaught will sink into the twilight along the eastern horizon in the coming days as it heads toward perihelion (closest approach to the Sun) on July 2.
现在用双筒望远镜很容易找到麦克·诺特彗星，它将在以后一段时间，在黎明东边地平线上慢慢下落，7月2日过近日点。
2·The point in the orbit nearest the sun is called perihelion, while the point farthest is called aphelion.
在轨道上最接近太阳的点被称为近日点，而最远离太阳的点被称为远日点。
3·But it's not that simple either, because the dates of the perihelion and aphelion are also shifting.
但这并不是简单的一件事情，因为近日点和远日点的日期都会变换。
4·This paper derives in detail the gravitational field of the sun by using the Schwarzschild metric, and expounds the advance of the Mercury's perihelion with the general theory of relativity.
用史瓦西度规详尽地推导了太阳引力场，用广义相对论解释了水星近日点的进动。
5·W hen the Earth moves from perihelion to aphelion, its radiation belts are expansion, and aphelion to perihelion contraction.
当地球从远日点运动到近日点时，地球辐射带向内收缩。