Privacy

What Henge Days records while you use it, and why.

What is recorded

The addresses and place names you search for, where they resolved to, and whether a building outline was found. This is how search problems get found and fixed.
For a plan along a street: the street's name, the distance between the two ends, the day, and whether the street was found. The two addresses themselves are kept only as searches, as above.
Which features you use: outline loads, calendars computed, calendar files downloaded, walls selected, tabs opened.
When you press Share, the link that was copied. For the first page you open on each visit, the page's address and the name of the website you came from, such as google.com, without the rest of that site's address.
When a chat or social app such as Messages, Slack or WhatsApp fetches a page of Henge Days to show a preview of a link, the name of the app and the page's address. Nothing about the person who pasted the link is recorded.
When an AI assistant such as ChatGPT, Claude or Perplexity, or a search engine's crawler, fetches a page, the agent's name, the page's address and whether it took the page's Markdown form. Nothing about the person who asked the assistant is recorded.
For each building page viewed, the building's name, the center of its outline, its next head-on day and the dates of each wall's head-on windows in the next 12 months are kept for 60 days, so that a shared link to the page, or to one wall and date on it, shows them in its preview. For each street planned, the street's name, the coordinates of its two ends, the day, the count of walls that get the sun and the first three stops are kept the same way. Nothing about who viewed the page is kept with them.
A random id stored in your browser, so that one visit can be told apart from another. It is not linked to your name or email unless you give them in feedback.
Your browser type, the country your connection comes from, and the version of the site you were using.
Google Analytics, a service from Google, records which pages are viewed and standard visit information such as browser and country, under Google's terms. It receives the web address of each page, and the address of a building page contains the place you searched for. Henge Days does not send it your email address or anything else you type.
Anything you type into the feedback form, with the page and building you were looking at. Your email address is kept if you enter it, or if you are signed in. Each message is also emailed to the site's owner, and the owner is emailed when an account is created.

If you sign in

Your email address is stored with your account. Sign-in emails are sent by Supabase, the service that holds the account database.
The buildings and henge days you save are stored under your account, with the building outline, the wall they refer to, any note you add, and whether you marked a day as shot or missed.
If you open the calendar feed in the planner, a secret link is made for your account. Anyone who has the link can read your saved days. Each time a calendar app reads it, the time of the read is recorded. Get a new link from the planner to stop the old one.
Usage records and feedback made while signed in are linked to your account instead of only to the browser id. The owner can see which account a piece of feedback came from.
A reply from the owner to your feedback is stored with it and shown in the feedback dialog. The time you first open a reply is recorded, so the Feedback button can stop counting it as unread.
Signing out ends the link. To delete your account and everything under it, use the Feedback button and ask.

What is not recorded

Your IP address is not stored.
Your precise location is not requested. The map's locate button, if you use it, stays in your browser.
To show a cloud forecast, the coordinates of a wall and the time of its head-on minute are sent to Open-Meteo, the weather service. No account or browser id goes with them.
The address you enter in the newsletter form goes to Substack, the service that sends the Henge Days newsletter, under Substack's terms. Henge Days does not record it, and your account on Henge Days is not subscribed to the newsletter. Henge Days records that a form was sent, and whether you opened or closed the newsletter banner at the top of an article. Your browser keeps when you closed the banner, or that you subscribed, so the banner stays hidden.
No advertising, and nothing is sold or shared. Google Analytics, listed above, is the only service from another company that records visits.

How long it is kept

Usage records are kept for up to 12 months. Feedback is kept until it has been dealt with and for 12 months after that.

Questions

Use the Feedback button on any page.

Terms and accuracy

How the dates and times on Henge Days are made, what they leave out, and the terms for using them.

This page is written in plain words. It is not legal advice.

What the dates are

Every date and time on Henge Days is computed. Nobody has stood at a given building on a given date to check it.

The sun's position comes from the NOAA solar position algorithm, accurate to about a hundredth of a degree. Refraction, the bending of light near the horizon, is included. This is the most reliable part of the result.
Building outlines come from OpenStreetMap, a map drawn by volunteers. An outline can be missing, simplified, a few meters out of place, or rotated by a degree or two.
A one degree error in the direction a wall faces moves the head-on moment by about four minutes. It can move a henge window by several days.
Addresses are looked up with public geocoders: Nominatim, the US Census Bureau geocoder and Photon. A search can land on the wrong building or on a range of addresses. Henge Days shows a warning when a match is known to be approximate or shared.

What is not included

Terrain and the horizon. Sunrise and sunset here mean the sun crossing a flat horizon. Hills, other buildings and trees can block a low sun for minutes or for the whole event.
Weather. The cloud figures shown for the next ten days are forecasts from Open-Meteo for that minute. A forecast can be wrong on the day. Haze, fog and smoke are not shown.
Access to the place you would stand: closures, traffic, construction, private property and local rules.
Clock times use the time zone of the building's location from the IANA time zone database (the standard list of world time zones), with daylight saving time applied. Check the time zone if the building is near a time zone border.

No warranty

Henge Days and everything it shows are provided as is. There is no warranty of any kind, express or implied, that the information is accurate, complete, or fit for any purpose.

Your responsibility

Check a location yourself before you rely on a date, travel to it, or plan a shoot around it. You are responsible for your own safety, for having the right to be where you stand, and for your own costs. Do not stand in a road to take a picture.

Liability

To the extent the law allows, the operator of Henge Days is not liable for any loss, injury, damage, expense or disappointment that arises from using the information on this site. This applies whether the information turns out to be accurate or not. It includes travel and booking costs and a missed sunrise or sunset.

Changes to the service

Henge Days can change, give different results, or stop at any time, without notice. Results for a building can change when its outline is edited in OpenStreetMap.

Map and address data

Building footprints are © OpenStreetMap contributors and available under the Open Database License (ODbL). Geocoding is by Nominatim, Photon and the US Census Bureau, and the basemap is by OpenFreeMap. Each of these services has its own terms.

Acceptable use

The Henge Days API is private and serves only the pages of this site. Do not scrape the site, call the API from scripts or other programs, or download results in bulk.

Questions

Use the Feedback button on any page.

Admin Dashboard

What needs a look since your last visit, then the site's health, where visitors come from, what they do, the feedback and accounts, and what Cloudflare and Supabase are costing.

Planner

Your buildings, with the map, the walls and the days you plan to be there.

Articles · October 17, 2026

Map of the Connecticut State Capitol in Henge Days, with its east-southeast wall highlighted in pink and every wall labeled with its bearing. — The Connecticut State Capitol, the first building in the list, in Henge Days. Pink marks the wall the sun lines up with on both Fall Weekend mornings.

Trinity College Family Weekend, October 23 and 24, 2026: the Long Walk and six buildings to photograph on campus and in Hartford

Trinity College Family Weekend, October 23 and 24, 2026: six walls in downtown Hartford that line up with the low sun, when to be there around the weekend's events, where to stand for the family picture, how the light falls on the Long Walk and the dates its walls line up.

For October 23 to 24, 2026.

Fall Weekend at Trinity College, its Homecoming and Family Weekend, runs on Friday, October 23, and Saturday, October 24, 2026. No wall on campus lines up with the low sun on those two days. This guide lists the six walls in downtown Hartford, about 2 miles north, that do, with the times, a spot for the family picture and the dates the Long Walk lines up. Post yours with #HengeDays.

On Saturday the sun rises at 7:13 AM and sets at 5:55 PM. Every time in this guide is US Eastern. All six walls are golden days: at the head-on moment the sun is 2 to 6 degrees up, 12 to 37 minutes after sunrise or before sunset.

The weekend's schedule and the light

Trinity's own site did not load when this guide was written, on October 17. The dates come from the College's 2026-27 academic calendar, and the events from the Fall Weekend page of the Office of Alumni Engagement, both as a web search returned them. That page calls its schedule tentative. The search summary gave the times below but cut off before the morning items, and it did not reach Saturday's program. It did not name the day of each item. Jum'ah and Kabbalat Shabbat are Friday services, and the list puts the items that fall between them on Friday too. Check the schedule at trincoll.edu/alumniandfamilies/homecoming before you plan around it.

Friday, October 23: Fall Weekend begins. Sunrise is at 7:12 AM and sunset at 5:57 PM. Downtown, Hartford Square North lines up at 7:27 AM, the Hartford Public Library at 7:29 AM, the State Office Building at 7:42 AM, the Legislative Office Building at 7:47 AM and the State Capitol at 7:48 AM. All five are within 1.5 km of each other.
Friday, October 23, noon to 1:30 PM: the Environmental Sciences "McCook Out" lunch, with a $10 fee paid at registration. After the morning walls downtown, campus is a 10-minute drive back.
Friday, October 23, 1:00 PM: Jum'ah service.
Friday, October 23, 1:30 to 3:30 PM: library tours and an open house.
Friday, October 23, 4:30 to 5:30 PM: Career Connections, for alumni, families, students and the Career and Life Design team. Also at 4:30 PM: the Swimming and Diving alumni meet. At 5:00 PM the sun is 9 degrees up in the west-southwest, and late light reaches the Long Walk's front on the Main Quad.
Friday, October 23, 5:30 to 8:00 PM: Kabbalat Shabbat service and dinner. The only evening wall in this guide, the Connecticut Convention Center, lines up at 5:20 PM, about 2.5 km from campus. On Friday that leaves no time. Go on Saturday.
Saturday, October 24: the search reached no events. The morning walls line up one or two minutes earlier than on Friday: Hartford Square North at 7:25 AM, the library at 7:27 AM, the State Office Building at 7:41 AM, the Legislative Office Building at 7:46 AM and the Capitol at 7:47 AM, the family photo spot below. In the evening, the Convention Center lines up at 5:21 PM.

Part 1: The campus

The campus buildings stand on one grid. Seabury Hall, Northam Towers and Jarvis Hall on the Long Walk, the Chapel, the Raether Library and Mather Hall all have walls that face 86 or 87 degrees and 266 or 267 degrees. The Crescent Street townhouses and the Summit Street dorms face 79 to 81 degrees and 259 to 261 degrees. This weekend the sun rises at 105 degrees and sets at 255 degrees, so it never stands square to any of those walls. The scout found no named building on campus, in Frog Hollow or around Pope Park with a wall the sun lines up with on October 23 or 24.

The Long Walk's front faces west-southwest over the Main Quad, at 267 degrees. On Friday and Saturday afternoons the sun is 9 degrees up at 5:00 PM and 4 degrees up at 5:30 PM, at 245 and 250 degrees, 17 to 22 degrees off square. That light falls across the Quad onto the front of the Long Walk at a low angle. The dates below are when the sun stands square to the campus walls, from the same engine. The check for other buildings is not part of them.

The Long Walk's west front, Seabury Hall, Northam Towers and Jarvis Hall, at sunset: March 14 to 16, 2027, at 6:51, 6:49 and 6:47 PM, and September 27 to 29, 2027, at 6:31, 6:32 and 6:34 PM.
Mather Hall and the Raether Library, their west walls at sunset: March 13 to 15, 2027, at 5:51, 6:49 and 6:47 PM (the clocks move forward on March 14), and September 27 to 30, 2027, at about 6:30 PM.
The east walls of Jarvis Hall, Northam Towers, Mather Hall and the Raether Library, at sunrise: March 26 to 28, 2027, at about 6:47 AM, and September 15 to 17, 2027, at about 6:38 AM. Seabury Hall's east wall follows from March 31 to April 2, 2027, at about 6:40 AM.
The Trinity College Chapel, its east wall at sunrise: March 28 to 30, 2027, at 6:42, 6:44 and 6:45 AM, and September 13 to 15, 2027, at 6:37, 6:35 and 6:33 AM.

For a campus picture this weekend, stand on the Main Quad with the Long Walk behind the family between 5:00 and 5:30 PM. The sun is then low behind the photographer and to the right. These times come from the sun's position alone. Trees on the Quad and buildings west of it are not part of them.

Part 2: Downtown Hartford

Downtown Hartford is about 2 miles north of campus by Broad Street, a 10-minute drive. The State Capitol stands at the south edge of Bushnell Park, and four of the six walls are on or near the park. The Wadsworth Atheneum, the Old State House and the Travelers Tower are a few minutes' walk east of it, on Main Street. Between Friday's events, and on Saturday when the search reached none, downtown is where to walk. The five morning walls line up between 7:25 and 7:48 AM, so one morning covers all of them.

1 Connecticut State Capitol

Hartford, Connecticut

Wall: east-southeast, facing 111°
Sun: The low morning sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 7:47 AM, 5.3° above the horizon.
Leaves: A forecast issued September 25 put peak color around October 18 in most of Connecticut, give or take five days (More Than Just Parks). UConn Extension expected the peak in mid- to late October (Connecticut Public).
Where to stand: The wall is the east end of the Capitol. Stand on the lawn or the footpaths of the Capitol grounds, east-southeast of the wall, with the sun behind you. Stay off the drive that circles the building. The sun lines up with the wall at 7:48 AM on Friday and 7:47 AM on Saturday, 5.8 and 5.3 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. A building in front of it has no height in OpenStreetMap. The check assumed one and found its roofline at 4 degrees, below the sun on both days. Computed from the building outline and the sun's position, and not checked on the ground.

The Capitol is built of New England marble and granite and crowned by a gold-leaf dome (State of Connecticut). Richard M. Upjohn designed it, and it was finished in 1878 (Historic Buildings of Connecticut). It stands at the south edge of Bushnell Park.

Map of Connecticut State Capitol in Henge Days, with the east-southeast wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 111°, toward the sunrise on the days in the row below; every wall carries its bearing.

Fri, Oct 23 to Thu, Nov 5, 202614 mornings · best Thu, Nov 5

6:30 AM Golden sunrise, sun 0° up ESE 111° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of Connecticut State Capitol — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

Family photo spot. Stand the family on the Capitol grounds a few steps out from the east-southeast wall, turned partway toward the camera. The photographer stands east-southeast of them, with the sun low behind and to one side, which lights faces and the marble behind them in the same warm light. Go on Saturday at 7:47 AM, when the sun is lowest, or on Friday at 7:48 AM, about four hours before the McCook Out lunch on campus. Post it with #HengeDays. Computed from the building outline and the sun's position, and not checked on the ground.

2 Legislative Office Building

Hartford, Connecticut

Wall: east-southeast, facing 111°
Sun: The low morning sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 7:46 AM, 5.1° above the horizon.
Leaves: A forecast issued September 25 put peak color around October 18 in most of Connecticut, give or take five days (More Than Just Parks).
Where to stand: The wall is the building's east side, facing the Capitol. Stand on the walk along that side, east-southeast of the wall, with the sun behind you. Stay out of the road beyond the walk. The sun lines up with the wall at 7:47 AM on Friday and 7:46 AM on Saturday, 5.6 and 5.1 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. The Bushnell South Parking Garage rises toward the sun, but its roofline stays at 1.8 degrees, below the sun on both days. Computed from the building outline and the sun's position, and not checked on the ground.

The Legislative Office Building at 300 Capitol Avenue, west of the Capitol, holds the offices and hearing rooms of the General Assembly's members.

Map of Legislative Office Building in Henge Days, with the east-southeast wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 111°, toward the sunrise on the days in the row below; every wall carries its bearing.

Fri, Oct 23 to Thu, Nov 5, 202614 mornings · best Thu, Nov 5

6:28 AM Golden sunrise, sun 0° up ESE 111° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of Legislative Office Building — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

3 State Office Building

Hartford, Connecticut

Wall: east-southeast, facing 110°
Sun: The low morning sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 7:41 AM, 4.3° above the horizon.
Leaves: A forecast issued September 25 put peak color around October 18 in most of Connecticut, give or take five days (More Than Just Parks).
Where to stand: The wall is the building's east side, between Capitol Avenue and Buckingham Street. Stand on the walks and lawn east of it, with the sun behind you. The sun lines up with the wall at 7:42 AM on Friday and 7:41 AM on Saturday, 4.8 and 4.3 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. Buildings east of it have no height in OpenStreetMap. The check assumed one and found the highest roofline at 1.3 degrees, below the sun on both days. Computed from the building outline and the sun's position, and not checked on the ground.

A seven-story limestone building at 165 Capitol Avenue, finished in 1931 and renovated from 2018 to 2020. It houses the state's constitutional officers among other agencies (Connecticut Department of Administrative Services).

Map of State Office Building in Henge Days, with the east-southeast wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 110°, toward the sunrise on the days in the row below; every wall carries its bearing.

Wed, Oct 21 to Tue, Nov 3, 202614 mornings · best Tue, Nov 3

6:26 AM Golden sunrise, sun 0° up ESE 110° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of State Office Building — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

4 Hartford Public Library

Hartford, Connecticut

Wall: east-southeast, facing 107°
Sun: The low morning sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 7:27 AM, 2.0° above the horizon.
Leaves: Downtown's street trees follow the state's color. A forecast issued September 25 put peak color around October 18 in most of Connecticut (More Than Just Parks).
Where to stand: The wall is the library's east side, on Prospect Street. Stand on the sidewalk on the far side of Prospect Street, east-southeast of the wall, with the sun behind you. The sun lines up with the wall at 7:29 AM on Friday and 7:27 AM on Saturday, 2.5 and 2.0 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. A low building in front of part of the wall has no height in OpenStreetMap. The check assumed one and found 49 of the wall's 51 m in the sun on both days. Computed from the building outline and the sun's position, and not checked on the ground.

The Hartford Public Library moved from the Wadsworth Atheneum to 500 Main Street in 1957. An expansion and renovation that added about 145,000 square feet was completed in 2007 (Hartford Public Library).

Map of Hartford Public Library in Henge Days, with the east-southeast wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 107°, toward the sunrise on the days in the row below; every wall carries its bearing.

Fri, Oct 16 to Wed, Oct 28, 202613 mornings · best Wed, Oct 28

7:21 AM Golden sunrise, sun 0° up ESE 107° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of Hartford Public Library — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

5 Hartford Square North

Hartford, Connecticut

Wall: east-southeast, facing 107°
Sun: The low morning sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 7:25 AM, 1.7° above the horizon.
Leaves: A forecast issued September 25 put peak color around October 18 in most of Connecticut, give or take five days (More Than Just Parks).
Where to stand: The wall is the long east side, facing Taylor Street. Stand on the sidewalk on the far side of Taylor Street, east-southeast of the wall, with the sun behind you. The sun lines up with the wall at 7:27 AM on Friday and 7:25 AM on Saturday, 2.2 and 1.7 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. Saturday is the lower of the two. Nothing in the outlines stands in the way. Computed from the building outline and the sun's position, and not checked on the ground.

An office building between Columbus Boulevard and Taylor Street, north of Charter Oak Avenue, about 350 m south of the Connecticut Convention Center.

Map of Hartford Square North in Henge Days, with the east-southeast wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 107°, toward the sunrise on the days in the row below; every wall carries its bearing.

Fri, Oct 16 to Wed, Oct 28, 202613 mornings · best Wed, Oct 28

7:19 AM Golden sunrise, sun 0° up ESE 107° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of Hartford Square North — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

6 Connecticut Convention Center

Hartford, Connecticut

Wall: west-southwest, facing 249°
Sun: The low evening sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 5:21 PM, 5.4° above the horizon.
Leaves: A forecast issued September 25 put peak color around October 18 in most of Connecticut, give or take five days (More Than Just Parks).
Where to stand: The wall is the long west side, facing Columbus Boulevard. Stand on the plaza walks between the building and Columbus Boulevard, west-southwest of the wall, with the sun behind you. Stay out of the drives. The sun lines up with the wall at 5:20 PM on Friday and 5:21 PM on Saturday, 5.9 and 5.4 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. A low building with no height in OpenStreetMap stands close in front of the south end, where the wall steps back. With an assumed height it shades that end, so 166 m of the 279 m wall is in the sun on both days. Stand in front of the long stretch north of the step. Computed from the building outline and the sun's position, and not checked on the ground.

The Connecticut Convention Center stands on Columbus Boulevard at the east edge of downtown, between the city and the Connecticut River. Its long west-southwest side is the one evening wall in this guide.

Map of Connecticut Convention Center in Henge Days, with the west-southwest wall highlighted and every wall labeled with its bearing — The building page in Henge Days. The highlighted walls face 249°, toward the sunset on the days in the row below; every wall carries its bearing.

Fri, Oct 23 to Thu, Nov 5, 202614 evenings · best Thu, Nov 5

4:37 PM Golden sunset, sun 0° up WSW 249° wall

Its row in the Henge days list, with the time of the head-on moment on the best day. Save keeps that day in your planner, which can send it to your calendar app. Saving asks you to sign in with an email link; there is no password.

A year of head-on days for each wall of Connecticut Convention Center — The year for every wall of the building. Each row is a wall; the colored runs are its henge, golden and low-sun days.

Open this wall in Henge Days

How the list was made

Henge Days computed every named building within 300 to 450 meters of 19 points: the Long Walk and the Main Quad, the Chapel, Vernon Street and the Raether Library, the Ferris Athletic Center and Jessee/Miller Field, the Crescent Street townhouses, the Austin Arts Center and Summit Street, Allen Place, Park Street and Frog Hollow, Park Terrace and Pope Park, Bushnell Park and the State Capitol, the Old State House and Main Street, and the Wadsworth Atheneum and the Travelers Tower. A second, closer pass covered the campus, where the first pass reached the limit of outlines per point. It used OpenStreetMap outlines. It kept walls where the sun lines up with the wall within 6 degrees of the horizon on October 23 or 24.

It then traced the sun's path from points along each wall over all 1,998 outlines the scout loaded, and dropped walls where a neighboring building stands higher than the sun. Spectra Apartments near the Old State House lines up too, but One Financial Plaza and a taller building stand in front of it. Two days is a short window. The Wadsworth Atheneum, the Old State House, the Travelers Tower and the churches by Bushnell Park have no wall the sun lines up with on these days with a clear view.

Hills and trees are not part of that check, and the times assume a level horizon. Street trees still carry leaves in late October and can shade a wall when the sun is this low. Each entry names the building that rises highest toward the sun from in front of the wall. Where its outline carries no height, the check assumed one and the entry says so. Every date and time comes from the Henge Days engine for the wall's own bearing.

How to read each entry

Each entry shows the building as Henge Days shows it. The map marks the building's outline from OpenStreetMap, gives every wall its compass bearing, and highlights the wall that lines up with the sun. Below it are the wall's row from the building's Henge days list, with a Save button that keeps the best day in your planner, and a year of head-on days for every wall.

Plan a trip of your own

Search for a building, or tap one on the map, and pick the wall you want lit.
The Henge days list shows the next days the sun lines up with that wall, at the horizon or in golden light, with the time.
The Today tab shows the sun's path for one day and when it is square to each wall. Check the cloud forecast there before you go.
Save a day to your planner to get a reminder and a calendar entry, or use Along a street to find every wall that lines up along one road.

Any building has a page like the ones above, your student's dorm included. Whatever you shoot, post it with #HengeDays.

Find a wall in Henge Days Open your planner

Sources

Features

What Henge Days does, part by part, with a live example for each. Everything runs from a building's real outline and the sun's computed position.

Henge days for any building

Type an address or a landmark. Henge Days finds the building's outline in OpenStreetMap, gives every wall a compass bearing, and works out when the sun's bearing matches it. The Henge days tab lists every window for the next 12 or 24 months in date order: henge days with the sun on the horizon, golden light under 6°, low sun under 15°. Filters pick the tiers and sunrise or sunset. Each row has the best day, the time, a calendar event and a Save button.

Virginia Museum of Fine Arts, Richmond · Flatiron Building, New York

Today

The Today tab shows the chosen day for the selected wall: a timeline of when the sun strikes it and how squarely, the head-on minute, and the week ahead. The day can be any day you choose. A cloud forecast from Open-Meteo sits beside each day within 10 days.

The museum today

Along a street

Two ends of one street, the street's name or route number, and a day. Henge Days stitches the street's OpenStreetMap ways into one path, keeps the walls within 60 m that face the road, and lists the ones the sun reaches that day in the order you pass them. Each stop has the distance from the first end, the side of the road, the time the sun is square to the wall or at its best angle, the tier, and the wall. The map draws the street and marks each lit wall. A plan covers up to 5 km of one street.

US 17 through Tappahannock, December 12 · Main Street, Mathews, October 24 · Arthur Ashe Boulevard, Richmond, November 17

Planner

Sign in with an email link to save buildings and days. The planner keeps an agenda of your saved days in date order, with a countdown, the cloud forecast, and a note for each. The shot card for a day gives a stand point 1.5 wall lengths back from the wall, links to open it in Apple Maps or Google Maps, an arrive-by time, and a Shot or Missed mark afterwards. The agenda also lists days coming up at your saved buildings that you have not saved yet.

Open the planner

Calendar feed and calendar files

Any row downloads a calendar event with the stand point in its location. The planner also offers a private calendar feed: subscribe once in Apple Calendar, Google Calendar or Outlook and every saved day appears and stays current. The feed link can be rotated at any time.

Henge pages

A set of pages, one per building or street, with every head-on date and time for the year ahead written out on the page, computed when the site is built. They are for reading, for search engines and for AI assistants, and each has a Markdown form and a JSON file. The buildings and streets on the site's examples are there to start.

Henge pages

The Share button copies a link to the building, the selected wall and the map view. Pasted into a message or a post, the link shows the building's name and its next henge day, or the wall and date of the row you selected.

A link to one row at the museum

Open data and accuracy

Building outlines come from OpenStreetMap. Addresses are looked up with Nominatim, Photon and the US Census Bureau geocoder. Sun positions come from the NOAA solar position algorithm, computed in your browser for every day in the range. Cloud forecasts come from Open-Meteo. None of the dates are checked on the ground: hills, trees, other buildings and weather are not included, so treat each one as a plan to confirm before you travel. Terms and accuracy has the detail.

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Flatiron Building

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Church Lane, Tappahannock, VA

Main Street, Mathews, VA

North Arthur Ashe Boulevard, Richmond, VA

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Trinity College Family Weekend, October 23 and 24, 2026: the Long Walk and six buildings to photograph on campus and in Hartford

The weekend's schedule and the light

Part 1: The campus

Part 2: Downtown Hartford

1 Connecticut State Capitol

2 Legislative Office Building

3 State Office Building

4 Hartford Public Library

5 Hartford Square North

6 Connecticut Convention Center

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Open data and accuracy