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.
e: moved to TLC
That first one feels like a web version of Stellarium, there’s a desktop version and a mobile version and you can even check what’s going to happen ahead of time with them. If you get the mobile version you can even enable movement tracking to see exactly what you’re looking at by pointing the phone towards it.