Aphelion is the farthest orbital point from the sun and perihelion is the closest.

Aphelion（远日点）是离太阳最远的轨道点，而Perihelion（近日点）是指最近的。

The project team said it had confirmed that sunlight was responsible for moving the spacecraft to an orbital high point of about two kilometers.

该项目团队表示，已确认是太阳光将航天器的轨道高度提升了约2公里。