轨道正沿着西北方向，几乎和明暗分界线平行，这使得看到一个明显的正北方向的日出成为了可能。
The orbital complex was tracking northeastward, nearly parallel to the terminator, making it possible to observe an apparent "sunrise" located almost due north.
明暗界线：月亮或内行星亮和暗的区域之间的分界线。
The dividing line between the bright and shaded regions of the disk of the moon or an inner planet.
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