I’ve tried googling, but can’t find anything. Over the last few months I’ve noticed a couple green searchlights or lasers lighting up the sky. I think it’s coming from London, but it could be somewhere north of it. I’m looking from about 15 miles due north of the city center. I’m hoping someone can tell me where they are coming from.
A green laser (directed skyward) featured in the closing ceremony for the Paralympics - maybe you saw that (or a rehearsal/test).
There’s a laser in Greenwich that marks the meridian;
Thanks, I think that must be it. The direction is about right, and it’s similar in appearance to the 13 mile picture in your link.
I also hadn’t realised, I cross the meridian twice a day on average.