My first thought was that there could have been something on the lens, then i thought no because its moving in time with the sun.
Then i thought well it could be an insect moving with the sun, then i thought no dont be silly.
Although it could be the moon...
CRESCENT SUNSET: In Hawaii, just before sunset on Oct. 13th, the moon glided in front of the sun producing a partial solar eclipse. On the beach at Wailea, Maui, Rob Ratkowski took this picture of the sun with a strange bite taken out of it:
"The clouds came in and during the best part of the eclipse a large cloud blocked my view," laments Ratkowski. "At the last moment, though, the eclipsed sun dropped below the cloud and was seen through an offshore squall."
www.spaceweather.com
Now the moon should be alot bigger than that black dot in them images.
The only other thing i can think of would be a sun spot but if it was a sunspot or coronal hole it would huge and there are not reports of any huge sunspots earth facing at the moment only one small one.
I doubt very much that its any sort of ufo etc.
One last thing it could just be something to do with the webcam because the sun is so bright that this could be some sort of lens flare or something else along those lines, and because webcams are not very good with lighting it could just be something to do with the way the cam reacts to bright light.
