That is because Mars follows what is known as an eccentric orbit meaning that unlike the orbit of the earth, it is far from circular.

这是因为火星遵循的是所谓的偏心轨道，这意味着与地球的轨道不同，它远非圆形。

The eccentric orbit of the comet never influences astronomical calculations respecting the invariable order established in the motion of the principal bodies of the solar system.

彗星的偏心轨道从不影响关于太阳系主要天体运动中建立的不变秩序的天文计算。

However, Mars has what is known as an eccentric orbit meaning that during some months it is much closer to the sun while for others it is much much further.

然而，火星具有所谓的偏心轨道，这意味着在某些月份它离太阳更近，而在其他月份则远得多。