Manhattanhenge stands for Manhattan Solstice – a circumstance which occurs twice a year, when the setting sun aligns with the east–west streets of the main street grid in the borough of Manhattan, New York City.
According to Neil deGrasse Tyson – the astrophysicist who basically founded this phenomenon:
What will future civilizations think of Manhattan Island when they dig it up and find a carefully laid out network of streets and avenues? Surely the grid would be presumed to have astronomical significance, just as we have found for the pre-historic circle of large vertical rocks known as Stonehenge, in the Salisbury Plain of England. For Stonehenge, the special day is the summer solstice, when the Sun rises in perfect alignment with several of the stones, signaling the change of season.
This year the beauty of the aligned sunset already hit the Big Apple on May 28th. If by any chance you missed it, you’ll be able to catch another one on July 13th.