Anonymous

A black dot on the sun could only be a transit of Mercury or Venus.

Anonymous

That's deliberately put in because otherwise the Sun is so bright it would burn out the camera, or more importantly, you wouldn't be able to see details of the Sun's corona without it. Which part of previous answers don't you understand?

Anonymous

Which part of "the camera's sensor is overloaded by too much light" from the previous answers to your basically the same question you keep asking over and over you didn't understand?

Anonymous

looks like a total solar eclipse to me

Anonymous

Camera-caused effect.