They cross in front of their star about once every 19.24 and 38.91 days, but those times can vary by up to 4 minutes for the inner planet and 39 minutes for the outer one.
它们每次经过恒星面前的时间，分别大约是19.24天和38.91天，但这个时间间隔有一定的变动范围，里层行星在4分钟范围内，外层行星在39分钟范围内。
The dividing line between the bright and shaded regions of the disk of the moon or an inner planet.
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.
明暗界线：月亮或内行星亮和暗的区域之间的分界线。
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