This picture was taken off the observatory screen with my iPhone. You can see mercury betweenthe eight and nine position of the sun. You have to look closely as it just looks like a faint black dot.

This photo was taken from the observatory screen Using my iPhone,showing mercury transiting across the sun. You can barely see a black dot between eight and 9 o’clock positions on the face of the sun.
Fascinating to see this looking through the huge Astro scopes that were set up at the observatory.