So now, this parallel as a circle of radius, well, the radius is less than a because if your vertical is to the North Pole, it will be actually much smaller.
这个平行线是一个有半径的圆，这个半径是小于a的，因为如果这个环越靠近北极点，它的半径实际上会越来越小。
OK,so this guy,so that's a piece of what's called a parallel in geography That's a circle that goes east-west.
这条线在地理上是条平行线,它是个东西向的圈。
Uranus isn't eccentric; its path is almost a perfect circle. Strangely though, Uranus' axis of rotation is almost parallel to the ecliptic plane. Uranus has 27 moons.
天王星是没有偏心，其路径几乎是一个完美的圆圈。很奇怪，旋转天王星的轴几乎平行于黄道面。天王星有27个卫星。
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