No, we are not talking about fancy disco trousers here. What this is about is brief flashes visible at various points of the (usually) night sky, caused by sunlight reflecting off the antennae of communications satellites used by the Iridium Satellite Phone Communications Network. Flashes often appear brighter that most stars, and can be seen anything between zero and several times during a typical night, if the sky is clear enough to see stars. Each antenna is only about the size of a door, but it is very flat and reflective. The satellites operate in low Earth orbit - about 780km - and travel at about 27,000km/hr. There is absolutely tons of information about Iridium Flares and how to predict them online, so if you are interested, just use your favourite search engine - I do not want to do a major writeup about it, since it has already been done many times before and much better than I could manage.
When I finally became aware of Iridium Flares earlier this year, I quickly became obsessed with the idea of observing as many of them as possible - not all of the satellites that were launched are still visible - some of them have crashed, broken or otherwise gone out of control, so I will never catch them all, but using the prediction facilities available online, I intend to catch those that I can.
Since this is currently a work-in-progress, I have decided to keep a record using an online spreadsheet, which is what will open up in a new page if you click on the link below. It means I can update the log by mobile or whatever without having to mess with this page. If you are interested in how my quest is going, bookmark this page and revisit from time to time. You never know - maybe you'll get the bug too.