The Earth's transit in front of the Sun as seen from Jupiter

"The alignment of both the Sun and the Earth with another planet in the Solar System is a rare event, which we are seldom able to observe in a lifetime. The Sun-Venus-Earth alignment for example only takes place once every 105.5 or 121.5 years. Similarly, the next Sun-Earth-Mars alignment will only occur in 2084. But on 5 January 2014, we were lucky enough to witness one such rare event: the alignment of the Sun, Earth, and Jupiter. Much to our surprise, we saw a new physical effect never observed before." Read the full article on the Oxford University Press's Blog