Every June 21st, thousands of people flock to Stonehenge to watch a very special sunrise. On this day, the summer solstice, the sun is perfectly positioned to shine through the narrow opening between the heel stones and onto the altar stone. The monument was built about five thousand years ago and historians still do not know whether it was built for religious or scientific purposes.
Image from the BBC.
A similar phenomenon occurs semiannually at MIT. For the past four special days, the sunset was at the perfect angle to beam down the Infinite Corridor. At 4:50 pm, people popped their heads out of their offices and labs to see this special occurrence.
And voila! It was pretty cool, and I was only slightly blinded from the experience. Missed it this year? No worries, find out when you can see it next here.