The Dark Twin is shown opposite the Earth, identified not only by being on the opposite side of the Sun but by the counterclockwise orbit direction that they both assume.

黑暗双星显示于地球的对面，这不仅可以从它在太阳对面看出来，还有它和地球都采用的逆时针轨道方向。

youdao

First, its orbit appears to run in the opposite direction from those of the nine known planets.

ECONOMIST: X marks the spot