Twice a year, the sun aligns precisely with the Manhattan street grid at sunset, sending a radiant glow from west to east across New York City's valley of skyscrapers. This stunning New York City phenomenon is known as Manhattanhenge, or Manhattan Solstice, and was popularized by American Museum of Natural History astrophysicist Neil deGrasse Tyson. According to the AMNH, Manhattanhenge 2015 will take place on May 29 and July 13.