I’ll start with a couple I’ve found for keeping up with atomic clock time, but this question isn’t limited to timekeeping, it can also relate to celestial events, weather, etc…
I do like the sleek and streamlined time.ms site, but according to their whois data, they only started that site a couple months ago, while time.gov has been around since 1999.
Long standing sites are preferable, but either way, what other live data sites do you people recommend?
I’m a big fan of Time and Date’s Night Sky page: https://www.timeanddate.com/astronomy/night/usa/knoxville
Great for learning about what stars/planets/comets/meteor showers/eclipses/etc should be visible from your location.
And if one is into stargazing, another handy resource is this Light Pollution Map: https://www.lightpollutionmap.info/
If you’re into weather tracking, I like both Windy and the regular NWS weather maps for (roughly) realtime weather maps.
Not real-time, but still cool way to explore astronomy data from the Vera C. Rubin LSST: https://skyviewer.app/