We have just witnessed 2 unison black tyre shapes over our home in Bolton, Lancs.
The sighting happened at around 8.15pm and they stayed visible for around 15 mins.
We looked online and noticed a lady who had seen the exact same thing over a year ago
also from Bolton.
We wondered if you had discovered what it was. We actually saw two of these objects.
Unfortunately they were hard to see, but caught them clearly through our binoculars.
No photo evidence unfortunately.
Below is an image from the 2015 Bolton 'tyre' case.