Can you see this small unusual spot on the Sun? If you look closely, it is almost perfectly round…
Image credit David Cortner
The situation could technically be labeled a Mercurian annular eclipse with an extraordinarily large ring of fire. From above the cratered planes of the night side of Mercury, the Earth appeared in its fullest phase. Hours later, as Mercury continued in its orbit, a slight crescent phase appeared again.
Mercury’s Transit. Credit NASA
Planet Mercury. Credit NASA