Excuse the Wrong Coast diversion, but this is too cool to pass up. Spotted on the L.A.-rooted Boing Boing (posted by Angeleno Xeni Jardin):
Today, if it is clear, Manhattan will flood dramatically with sunlight just as the Sun sets precisely on the centerline of every street.
Usually, the tall buildings that line the gridded streets of New York City's tallest borough will hide the setting Sun.
This effect makes Manhattan a type of modern Stonehenge, although only aligned to about 30 degrees east of north. Were Manhattan's road grid perfectly aligned to east and west, today's effect would occur on the Vernal and Autumnal Equinox, March 21 and September 21, the only two days that the Sun rises and sets due east and west.
If today's sunset is hidden by clouds do not despair -- the same thing happens every May 28 and July 12.
Original source: NASA