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Ground level from the UK (only a limited number of people are allowed on the CERN site at the moment, and I'm not one of them).From ground level in the UK, with special equipment or at CERN? Just curious.
The last time I saw a clear full night sky was at a wedding in a farm field about 12 years ago!
Those skies don't stop by London.
you'd have to know the ISS trajectory / timings?
Is it visible naked?
Ground level from the UK (only a limited number of people are allowed on the CERN site at the moment, and I'm not one of them).
It's quite visible with the naked eye if you know when to look. Though it's only visible for a couple of hours after dusk and before dawn (you need the sky to be dark but the station to be in sunlight), and it doesn't always pass over during that window. On a good pass it can be the brightest thing in the sky apart fromo the moon. In fact I watched it again tonight. There are Android apps that will tell you when it will be visible from your current location, what direction, how bright, and I do have one on my phone.
I'm not sure whether I saw the SpaceX capsule as well: I know it was due around the same time as the ISS, but didn't have accurate information exactly where and when, soo while I did see something else around that time there are other satellites out there as well so I can't be certain that was it (while I've seen ISS often enough that I'm familiar with how it moves, so could probably ID it if I saw it even without knowing the schedule).