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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.
Supercluster (iOS) tells me all sorts of things, even ones I don’t remember asking for. It might have what you need.