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What is the proper terminology for when a satellite or spaceship passes into a planet's shadow or night side? Is it crossing the terminator? Passing into eclipse (or something better)? If there is a different name for coming back into the light, what would that be as well?

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    $\begingroup$ This was the better site to ask, but now that you have an answer on this question in Astronomy SE it's best to close this or delete it. You didn't know it yet, but cross-posting questions (same questions on multiple sites) is strongly discouraged in Stack Exchange because it leads to fragmentation of answers (good answers spread out over multiple sites). Now that that question has an answer, the only way to get it here is to close it in Astronomy and then have migrated. $\endgroup$ – uhoh Dec 28 '19 at 16:40
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    $\begingroup$ I'm voting to close this question as off-topic because it is crossposted from Astronomy SE where an answer exists already. Best to close (or delete) this and migrate that one. $\endgroup$ – uhoh Dec 28 '19 at 16:41
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    $\begingroup$ I think people mostly say that " the satellite is in eclipse " $\endgroup$ – John Dec 28 '19 at 21:19
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    $\begingroup$ @Adham That's good for already being on the night side, but what about the actual transition point? Would someone aboard the ISS say "We are crossing into/out of eclipse?" $\endgroup$ – Trevortni Dec 28 '19 at 21:45
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    $\begingroup$ I'm voting to close this question as off-topic because it is crossposted $\endgroup$ – Rory Alsop Dec 28 '19 at 23:12