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ManhattanhengeManhattanhenge is the name given to an event that occurs when the setting sun aligns with the east–west streets of the main street grid in the borough of Manhattan in New York City.

The term Manhattanhenge is a neologism from Stonehenge where the sun aligning with the ancient stones on the solstices is an famous event. The Manhattanhenge term was popularized in 2002 by Neil deGrasse Tyson, an astrophysicist at the American Museum of Natural History.

Today is the last time in 2017 that the alignment will occur. The New York event occurs twice a year.

The event applies to those streets that follow a plan from 1811 which laid out the streets in a grid offset 29.0 degrees from true east–west. During Manhattanhenge, an observer on one of the gridded east-west streets will see the sun setting over New Jersey directly along the centerline of that street.

The dates of Manhattanhenge usually occur around May 28 and July 12 being spaced evenly around the summer solstice.

On two corresponding mornings, the sun rises on the center lines of the grid on (approximately) December 5 and January 8, spaced evenly around the winter solstice. As with the solstices and equinoxes, the dates vary somewhat from year to year.

This phenomenon occurs in other cities with a uniform street grid. For North Americans who want to be Druids for a day, Baltimore, Chicago and Toronto also have their -henge days.

The events would only coincide with the vernal and autumnal equinox only if the grid plan were laid out precisely north-south and east-west, and perfectly aligned with true north as opposed to magnetic north. Someone should plan a new city for that to happen.

 

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