In particular, the speed of the Moon around the Sun will never be negative, so the Moon will never loop backwards.

特别是月球绕行太阳的速度决不可能是负的，所以月球永远不会向后打转。

youdao

A NASA Solar and Heliospheric Observatory image of the Sun shows a giant magnetic loop (lower left) filled with glowing, hot gas blasting away from the Sun.

美国宇航局太阳和太阳风层探测器拍摄的太阳图像，显示出巨大的磁场环(左下)，充满猛烈脱离太阳的流动热气。

youdao

Moreover, the sun position in the sky is obtained by astronomic algorithms in the case of open loop.

由天文历法来计算太阳在天空中的位置。

youdao

Moreover, the sun position in the sky is obtained by astronomic algorithms in the case of open loop.

由天文历法来计算太阳在天空中的位置。

youdao