Manhattanhenge: Sun to align perfectly with New York street grid

Manhattanhenge: The street grid of New York's oldest and largest borough will briefly transform into a Stonehenge-like sundial, as the sun alights up the north and south sides of every cross street.

New Yorkers will be treated to a special sight tonight: Today is one of two days a year when the setting sun aligns perfectly with Manhattan's street grid. As the sun sets on the Big Apple, it will light up both the north and south sides of every cross street.

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The event has been dubbed "Manhattanhenge" for the way it turns New York City into a?Stonehenge-like sun dial.

The sun sets perfectly in line with the Manhattan street grid twice a year, explains astrophysicist Neil deGrasse Tyson on the Hayden Planetarium website.

Here are the best viewing times for Manhattanhenge 2012:

May 29 at 8:17 p.m. EDT

July 12 at 8:25 p.m. EDT

There are two other days when the sun isn't perfectly aligned with the grid, but still puts on a show. On these two days, May 30 and July 11 this year, you see a full sun sitting on the horizon when looking down the cross streets, rather than the half orb. Here are the best times to catch the full sun setting on New York City:

May 30 at 8:16 p.m. EDT

July 11 at 8:24 p.m. EDT

The best way to watch Manhattanhenge, Tyson says, is to get as far east as possible on one of the city's major cross streets, such as 14th, 23rd, 34th, 42nd or 57th streets, and look west toward New Jersey. (The streets immediately adjacent to these wide cross streets will work fine, too, but the view won't be quite as stunning.) Standing on 34th or 42nd street provides a particularly nice view, as the views include the?Empire State Building?and the Chrysler Building. It's a good idea to get to your spot 30 minutes early, so you can beat out the other sun worshippers.

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