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During the day it also activates for neat clouds and pretty sunsets.
PSA: This xkcd was released 6 days ago and nobody posted it. It is in fact allowed for other people to post new xkcd comics to this community too, you don’t have to wait for me to do that.
I have an app called Star Walk 2 that does something very similar. Notifications about cool shit happening and then helps you to look in the right direction for it, including ISS fly-bys.