Manhattanhenge viewing parties are not unknown, but it is mostly a DIY affair. People gather on east-west streets a half-hour ...

The “henge” phenomenon — named after the famous ... including New York and Boston. In the days around the fall and spring equinoxes, when daylight and nighttime hours are nearly equal ...

astronomers say these "henge" events are created by the sun's path aligning with city streets. They typically take place at sunrise or sunset. Similar occurrences happen in Manhattan and Boston.

They typically take place at sunrise or sunset. Similar occurrences happen in Manhattan and Boston. KTVU shot a timelapse video of the twice-a-year event. For more on the henge.