>The original is here: https://darkhours.app

Ooof that is a terrible dark mode theme.

I think "night vision" is different from dark mode. It's meant to prevent your eyes from adjusting to the light - so you can still see the stars - rather than just being easy to look at.

It's so that you don't lose your dark adaptation. See: https://www.nps.gov/articles/dark-adaptation-of-the-human-ey...