Twice a year, Manhattan's streets line up with the setting sun and the city stops to look. Every wall on Earth has days like that. Henge Days finds yours, down to the minute.
Works anywhere OpenStreetMap has buildings. No account needed.
Featured · live
New York
walls that get a true henge walls lit head-on only with a higher sun
See its henge days →Real footprints, real sun. Each card is computed as you read it.
Every wall faces a compass direction. The sun's bearing sweeps across the sky each day. At the instant the two match, light strikes the wall head-on: shadows vanish into the surface, texture flattens, colour saturates, and anything standing in front is lit from behind the camera.
For most walls that instant comes with the sun high. On a henge day it comes at sunrise or sunset, with the sun sitting on the horizon exactly where the wall points. That is Manhattanhenge, and it is not special to Manhattan: it is a property of any wall whose bearing the sun reaches at the horizon some day of the year.
Henge Days computes that for the building you name, from its real footprint, and ranks every day of the next year:
If you can only be there on certain dates, tell it when, and it picks the best of what you have, even a fringe day.
What Henge Days records while you use it, and why.
Usage records are kept for up to 12 months. Feedback is kept until it has been dealt with and for 12 months after that.
Use the Feedback button on any page.
Usage over the last 30 days and the feedback inbox.
The henge days you have saved, soonest first.
What changed in each release of Henge Days, newest first.