THE SCALE OF MERCURY: What will tomorrow’s transit of Mercury look like? Marek Nikodem has the answer. He watched the previous transit of Mercury (May 9, 2016) from Kcynia, Poland, and photographed the event at sunset:
Mercury is the black dot near the bottom of the sun. It’s pretty tiny. Mercury is only 1/194th of the sun’s apparent diameter. That’s why looking at the sun through ordinary eclipse glasses won’t work. You need magnification–50x or more is recommended.