[Stratoscope]

The Weather Underground app for Android and iOS displays first light and last light.

[chrisseaton]

Ah and even moon-rise and moon-set! But it doesn't seem to tell you for any day except today!

But errr... isn't the Weather Underground a domestic terrorism and bombing group?

[Jtsummers]

Contrary to what the others posted, the name is only a reference. The weather service is not a continuation of the earlier group.

It was acquired by The Weather Channel (later The Weather Company) which was later acquired by IBM.

[nefitty]

They pivoted to weather data services

[zepto]

It used to be a terrorism and bombing group, but then they pivoted into running a network of amateur weather stations.

(Since the bombing group was underground we can of course never know for sure exactly which members were part of the pivot)