In article ,
Henry Spencer wrote:

In article ,
Robert Casey wrote:

In particular, check the iamge taken at 11:07 UT --- no black drop
visible there.

I don't see any teardrops either. Must be an artifact of the human eye.

No, it has been photographed during transits of Mercury (which also proves
that it is not a result of Venus's atmosphere).

The Black Drop is an effect of how our eyes perceive when two unsharp
edges between bright and dark approach one another. It can be readily
simulated by keeping two of your fingers as close to your eye as you can
and then let the fingers approach one another: they seem to touch before
they actually touch.

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