Mercury’s solar crossing only occurs 13 times a century, and it’s happening this Monday And NASA is going to help you see it By Loren Grush on May 4, 2016 01:29 pm @lorengrush http://www.theverge.com/2016/5/4/11590228/mercury-solar-crossing-watch-transit-sun-earth The planet Mercury will pass between the Earth and the Sun on May 9th, marking a rare celestial event that occurs only 13 times a century. […]