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Key Facts In This Video

  1. Manhattanhenge refers to the two dates a year when the sunset lines up with Manhattan's street grid. 00:27

  2. Manhattanhenge doesn't fall on the equinox because Manhattan's street grid is rotated about 30 degrees from true north. 01:18

  3. For a city to be "hengeable," it needs flat terrain, a clean horizon, and a grid. 03:14