Show HN: Nightwatch – a Mac menu-bar app that tells you when tonight is clear

Automated excerpt

Alerts: a heads-up an hour before sunset when tonight looks clear, with your plan and what the second forecast thinks, and a nudge as the clear window opens. Tonight or tomorrow night: the whole Targets window can show tomorrow night instead, so you can plan ahead. The first clear window after installing opens its alert with "Your first clear window with Nightwatch", once.

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