# Flatiron Building, New York: henge days

> 24 henge days a year on 2 walls. Next: sunrise square to the E wall, Mar 8, 2027 to Mar 10, 2027, best Mon, Mar 8, 2027 at 06:21.

Triangular plan between Fifth Avenue and Broadway. Three facades, three very different head-on times.

Computed on Oct 13, 2026 for the 12 months to Oct 13, 2027, from the OpenStreetMap outline (way/264768896). Times are local to New York (America/New_York). Open it in the app: https://hengedays.com/?example=flatiron. Machine-readable: https://hengedays.com/henge/flatiron-building-new-york.json.

## WNW wall (faces 299°, 49 m)

| Light | When | Dates | Days | Best day | Time | Sun height |
|---|---|---|---:|---|---:|---:|
| Henge | Sunset | May 26, 2027 to Jun 3, 2027 | 9 | Wed, May 26, 2027 | 20:14 | 0° |
| Golden | Sunset | May 26, 2027 to Jul 16, 2027 | 52 | Wed, May 26, 2027 | 20:14 | 0° |
| Low sun | Sunset | May 26, 2027 to Jul 16, 2027 | 52 | Wed, May 26, 2027 | 20:14 | 0° |
| Henge | Sunset | Jul 8, 2027 to Jul 16, 2027 | 9 | Fri, Jul 16, 2027 | 20:23 | 0.1° |

## E wall (faces 96°, 55 m)

| Light | When | Dates | Days | Best day | Time | Sun height |
|---|---|---|---:|---|---:|---:|
| Henge | Sunrise | Mar 8, 2027 to Mar 10, 2027 | 3 | Mon, Mar 8, 2027 | 06:21 | 0.1° |
| Golden | Sunrise | Mar 8, 2027 to Mar 18, 2027 | 11 | Mon, Mar 8, 2027 | 06:21 | 0.1° |
| Low sun | Sunrise | Mar 8, 2027 to Apr 2, 2027 | 26 | Mon, Mar 8, 2027 | 06:21 | 0.1° |
| Low sun | Sunrise | Sep 10, 2027 to Oct 5, 2027 | 26 | Tue, Oct 5, 2027 | 06:59 | 0.3° |
| Golden | Sunrise | Sep 25, 2027 to Oct 5, 2027 | 11 | Tue, Oct 5, 2027 | 06:59 | 0.3° |
| Henge | Sunrise | Oct 3, 2027 to Oct 5, 2027 | 3 | Tue, Oct 5, 2027 | 06:59 | 0.3° |

## SSW wall (faces 209°, 23 m)

The sun never strikes this wall head-on under 15°; it gets only high sun.

## About these dates

A henge day has the sun on the horizon, under 1.5° up, square to the wall. Golden is under 6°, low sun under 15°. Every date and time here is computed from the building outline in OpenStreetMap and the position of the sun, never checked on the ground. An outline a degree off moves the head-on minute by about four minutes. Hills, trees and other buildings can block a low sun. Treat each date as a plan to confirm before you travel. See https://hengedays.com/terms.md.