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 Holy Trinity Orthodox Cathedral on Park Drive in Henge Days, with its west-southwest wall highlighted in pink and every wall labeled with its bearing. — Holy Trinity Orthodox Cathedral on Park Drive, the family photo spot in this guide, in Henge Days. Pink marks the wall the setting sun lines up with on Family Weekend evenings.

Northeastern University Family Weekend, October 23 to 25, 2026: five buildings to photograph on campus and along Huntington Avenue

Five walls on Northeastern University's Boston campus and west of Huntington Avenue, by the Back Bay Fens and Fenway Park, that line up with the sunrise or sunset during Family & Friends Weekend, October 23 to 25, 2026, with the weekend's listed events and a spot for the family photo.

For October 23 to 25, 2026.

Family & Friends Weekend at Northeastern University runs from mid-day Friday, October 23, to mid-day Sunday, October 25, 2026. The five buildings below have a wall that the sun lines up with on those days. Two are on the Boston campus, and three are a walk west of Huntington Avenue, by the Back Bay Fens and Fenway Park. Post your pictures with #HengeDays.

All times are US Eastern time. On Saturday the sun rises at 7:07 AM and sets at 5:48 PM. Every wall here gets golden light, with the sun 2 to 6 degrees up when it lines up. No wall in the area meets the sun at the horizon this weekend with a clear view.

The weekend's schedule and the light

Henge Days could not open the University's Family & Friends Weekend page for this guide. The dates and the events below come from search-engine summaries of that page on October 17, and those summaries list no times. Check the page for the schedule before you plan around it.

Friday, October 23, morning: the program starts at mid-day. Sunrise is at 7:06 AM. Before the program starts, 142-148 Hemenway Street (entry 1) lines up at 7:34 AM, 4.2 degrees up, about 300 meters from Krentzman Quadrangle. It is the one morning wall this weekend.
Friday, October 23, evening: the search results name no evening event. The evening walls line up between 5:18 PM (Bower, entry 5) and 5:31 PM (Renaissance Park Garage, entry 2), and the sun sets at 5:49 PM.
During the weekend, with no days or times in the search results: a visit to the Museum of Fine Arts, a tour of Fenway Park, a cappella performances and a Fall Festival. The museum is on Huntington Avenue, about 450 meters from Holy Trinity Orthodox Cathedral (entry 3). Fenway Park is about 400 meters from Bower (entry 5).
Saturday, October 24: the evening walls line up between 5:19 PM (Bower) and 5:33 PM (Renaissance Park Garage), and the sun sets at 5:48 PM. Holy Trinity Orthodox Cathedral at 5:25 PM is the family photo spot below.
Sunday, October 25, mid-day: the program ends. For families who stay, the three walls in Part 2 line up again between 5:21 and 5:27 PM. The two campus walls are in shade at their moments on Sunday.

Part 1: the Northeastern campus

Two walls on the campus have a clear view of the sun this weekend: one on the Fenway side for Friday morning, and one at Ruggles station on Columbus Avenue for Friday and Saturday evening.

1 142-148 Hemenway Street

Northeastern University, Boston, Massachusetts

Wall: east-southeast, facing 110°
Sun: The low morning sun lines up with this wall on Oct 23. Best: Friday, October 23 at 7:34 AM, 4.2° above the horizon.
Leaves: A forecast issued September 25 puts most of Massachusetts at peak around October 14, with the last places it covers on October 22 (More Than Just Parks). By Family Weekend that forecast has most of the state past peak.
Where to stand: The wall is the building's east side, which faces the paved walks behind it, away from Hemenway Street. Stand on the walk east-southeast of the middle of the wall, with the sun behind you, and frame the southern half. A neighboring building stands right in front of the northern end. On Friday the sun lines up with the wall at 7:34 AM, 4.2 degrees up. This is a golden day: at the head-on moment the sun is 2 to 6 degrees up. The New England Conservatory residence hall rises 3.8 degrees toward the sun in the outlines, so the light clears it on Friday only. On Saturday at 7:32 AM and Sunday at 7:30 AM the sun is 3.7 and 3.2 degrees up, below that roofline. This is a residence hall, so stay on the walks. Computed from the building outline and the sun's position, and not checked on the ground.
Clear view: Clear. No building in the map data rises above the sun (4.2° up) in its direction.

A Northeastern residence hall on Hemenway Street near Gainsborough Street, on the Fenway side of the campus, listed by that name on the University's move-in map (Northeastern Housing and Residential Life). A 1983 agreement with the city let Northeastern house students in these Hemenway Street apartments on the condition that low- and middle-income housing stays in the same buildings (The Huntington News). OpenStreetMap lists it as 142-148 Hemenway, so the building page shows that name.

Map of 142-148 Hemenway Street 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.

Tue, Oct 20 to Sun, Nov 1, 202613 mornings · best Sun, Nov 1

6:20 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 142-148 Hemenway Street — 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

2 Renaissance Park Garage

Northeastern University, Boston, Massachusetts

Wall: west-southwest, facing 252°
Sun: The low evening sun lines up with this wall on Oct 23 to 24. Best: Saturday, October 24 at 5:33 PM, 2.2° above the horizon.
Leaves: A forecast issued September 25 puts most of Massachusetts at peak around October 14, with the last places it covers on October 22 (More Than Just Parks). By Family Weekend that forecast has most of the state past peak.
Where to stand: The wall is the garage's short west-southwest end, facing Ruggles station. Stand on the walk between the garage and the station, west-southwest of the wall, with the sun behind you. Stay out of the garage drives. The sun lines up with the wall at 5:31 PM on Friday and 5:33 PM on Saturday, 2.7 and 2.2 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. A building toward the sun has no height in OpenStreetMap. The check assumed 9 meters and found its roofline at 2.0 degrees, under the sun on Friday and Saturday. On Sunday at 5:34 PM the sun is 1.7 degrees up, below it. If that building is taller than assumed, it takes the light sooner. Computed from the building outline and the sun's position, and not checked on the ground.
Clear view: Clear. No building in the map data rises above the sun (2.2° up) in its direction.

A public garage on the campus at 835 Columbus Avenue, at the corner of Melnea Cass Boulevard (Snell Library: getting to Snell Library). Ruggles station, on the Orange Line and the commuter rail, is next door, and the ISEC building and its bridge are a block northeast along Columbus Avenue. A family that drives in and parks here walks past this wall. OpenStreetMap spells it Rennaissance Parking Garage, so the building page shows that name.

Map of Renaissance Park Garage 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 252°, toward the sunset on the days in the row below; every wall carries its bearing.

Sat, Oct 17 to Thu, Oct 29, 202613 evenings · best Thu, Oct 29

5:39 PM Golden sunset, sun 0° up WSW 252° 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 Renaissance Park Garage — 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

Part 2: Huntington Avenue, the Fens and Fenway

The Museum of Fine Arts, Symphony Hall and the Christian Science Plaza with its reflecting pool are on Huntington Avenue, within about 700 meters of the Curry Student Center. Between events, that stretch of the avenue is where to walk. None of those buildings has a wall the sun lines up with this weekend with a clear view. The west wall of the First Church of Christ, Scientist lines up, but the Church Park apartments stand in front of it at that moment. For the evening light, walk west from the museum along the Fens to the three walls below. The cathedral comes first, then Trilogy on Boylston Street and Bower on Maitland Street, near Fenway Park.

3 Holy Trinity Orthodox Cathedral

Fenway, Boston, Massachusetts

Wall: west-southwest, facing 251°
Sun: The low evening sun lines up with this wall on Oct 23 to 25. Best: Sunday, October 25 at 5:27 PM, 2.9° above the horizon.
Leaves: A forecast issued September 25 puts most of Massachusetts at peak around October 14, with the last places it covers on October 22 (More Than Just Parks). By Family Weekend that forecast has most of the state past peak. The trees along Park Drive and in the Fens frame the cathedral from the sidewalk.
Where to stand: The wall is the cathedral's west side, 28 meters long. The map shows drives on that side, so stand on the Park Drive sidewalk southwest of the cathedral, with the sun behind you, and frame the west wall at an angle. The sun lines up with the wall at 5:24 PM on Friday, 5:25 PM on Saturday and 5:27 PM on Sunday, 3.9, 3.4 and 2.9 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. Nothing in the outlines stands in the way. Computed from the building outline and the sun's position, and not checked on the ground.
Clear view: Clear. No building in the map data rises above the sun (2.9° up) in its direction.

A parish of the Orthodox Church in America at 165 Park Drive, between Fenway Park and the Museum of Fine Arts (Orthodox Church in America). Immigrants from the Russian and Austro-Hungarian empires founded it in 1910 as a parish of the Russian Orthodox Church (Pluralism Project). Park Drive runs along the western side of the Back Bay Fens.

Map of Holy Trinity Orthodox Cathedral 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 251°, toward the sunset on the days in the row below; every wall carries its bearing.

Mon, Oct 19 to Sun, Nov 1, 202614 evenings · best Sun, Nov 1

4:36 PM Golden sunset, sun 0° up WSW 251° 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 Holy Trinity Orthodox Cathedral — 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 Park Drive sidewalk south of Holy Trinity Orthodox Cathedral, with its west wall behind them, turned partway toward the camera. The photographer stands farther west-southwest along the sidewalk, with the sun low behind and to one side, which lights faces and the cathedral's west wall in the same warm light. Go on Saturday at 5:25 PM or Sunday at 5:27 PM, when the sun is 3.4 and 2.9 degrees up. The Museum of Fine Arts is about 450 meters east. Post it with #HengeDays. Computed from the building outline and the sun's position, and not checked on the ground.

4 Trilogy

Fenway, Boston, Massachusetts

Wall: west-southwest, facing 250°
Sun: The low evening sun lines up with this wall on Oct 23 to 25. Best: Sunday, October 25 at 5:22 PM, 3.7° above the horizon.
Leaves: A forecast issued September 25 puts most of Massachusetts at peak around October 14, with the last places it covers on October 22 (More Than Just Parks). By Family Weekend that forecast has most of the state past peak.
Where to stand: The wall is the west-southwest face at the block's corner on Boylston Street, 20 meters long. Stand on the Boylston Street sidewalk a few steps west of the corner, with the sun behind you, and frame the wall at an angle. The sun lines up with the wall at 5:20 PM on Friday, 5:21 PM on Saturday and 5:22 PM on Sunday, 4.6, 4.1 and 3.7 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. Nothing in the outlines stands in the way. Computed from the building outline and the sun's position, and not checked on the ground.
Clear view: Clear. No building in the map data rises above the sun (3.7° up) in its direction.

An apartment block with shops on the ground floor, on Boylston Street between Brookline Avenue and Kilmarnock Street. Samuels & Associates built it in the Fenway Triangle (Banker & Tradesman), and Yardi Matrix lists it as completed in 2006 (Yardi Matrix). OpenStreetMap names it Fenway Triangle Trilogy, so the building page shows that name.

Map of Trilogy 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 250°, toward the sunset on the days in the row below; every wall carries its bearing.

Wed, Oct 21 to Mon, Nov 2, 202613 evenings · best Mon, Nov 2

4:33 PM Golden sunset, sun 0° up WSW 250° 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 Trilogy — 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 Bower

Fenway, Boston, Massachusetts

Wall: west-southwest, facing 250°
Sun: The low evening sun lines up with this wall on Oct 23 to 25. Best: Sunday, October 25 at 5:21 PM, 3.9° above the horizon.
Leaves: A forecast issued September 25 puts most of Massachusetts at peak around October 14, with the last places it covers on October 22 (More Than Just Parks). By Family Weekend that forecast has most of the state past peak.
Where to stand: The wall is the building's west side on Maitland Street, 36 meters long. Stand on the sidewalk on the far side of Maitland Street, west-southwest of the wall, with the sun behind you. The sun lines up with the wall at 5:18 PM on Friday, 5:19 PM on Saturday and 5:21 PM on Sunday, 4.9, 4.4 and 3.9 degrees up. These are golden days: at the head-on moment the sun is 2 to 6 degrees up. Nothing in the outlines stands in the way. Fenway Park is about 400 meters east. Computed from the building outline and the sun's position, and not checked on the ground.
Clear view: Clear. No building in the map data rises above the sun (3.9° up) in its direction.

Apartments at 771 Beacon Street, the first part of the Fenway Center development, next to the Lansdowne commuter rail station. Bower has 312 apartments in an 8-story building and a 14-story tower, and the first building opened in August 2020 (Banker & Tradesman, Green Cities). OpenStreetMap names it Bower Boston, so the building page shows that name.

Map of Bower 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 250°, toward the sunset on the days in the row below; every wall carries its bearing.

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

4:33 PM Golden sunset, sun 0° up WSW 250° 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 Bower — 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 350 to 450 meters of 14 points: Centennial Common, Krentzman Quadrangle and Ell Hall, Snell Library and the ISEC building, Matthews Arena and St. Botolph Street, Cabot and Marino on Huntington Avenue, the Columbus Avenue halls, the West Village, Hemenway Street, the Museum of Fine Arts, Symphony Hall and Massachusetts Avenue, the Christian Science Plaza, the Back Bay Fens and the Rose Garden, Fenway Park, and Berklee. It used OpenStreetMap outlines and kept walls where the sun lines up with the wall within 6 degrees of the horizon on at least one day from Friday, October 23, to Sunday, October 25. That found 62 walls. It then traced the sun's path from each wall and checked it against all 1,192 outlines fetched for the 14 points, including the ones outside the wall's own circle. It dropped the walls where a building stands higher than the sun. Nine walls passed. Eight walls that look clear from inside one point's circle have a taller building a short way outside it, among them West Village H and the west wall of the First Church of Christ, Scientist.

Four of the nine are left out. The outline named Burstein Hall is 3.2 meters tall in the map data, too low to be the residence hall of that name at 458 Huntington Avenue. The west wall of MGM Music Hall faces the grounds of Fenway Park, and the map shows no public place to stand in front of it. The outline named Red Sox Team Store is a 12-meter strip, and on Sunday a building on Brookline Avenue rises to within 0.1 degrees of the sun. Star Market at Boylston and Kilmarnock Streets planned to move to a new building nearby (The Boston Globe), so its building may not stand as mapped. That leaves five, all golden days, and each entry says so.

Boston's streets run at several angles, but most of the campus and the Huntington Avenue blocks face 62, 152, 242 or 332 degrees. This weekend the sun rises at 105 degrees and sets at 254. Three long southwest fronts line up with the setting sun at the horizon later in the fall: the Museum of Fine Arts from November 15 to 20, the Curry Student Center from November 19 to 24 and Snell Library from November 21 to 27, 2026. Those days were not checked for buildings in front.

Hills and trees are not part of that check, and the times assume a level horizon. Each entry names any building that rises toward the sun from in front of the wall. Where its outline carries no height, the check assumed 9 meters, 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. The Clear view line is the result of the check against every outline, on the best day with a clear view.

Any building has a page like the ones above, your student's hall included. Post your picture from one of these walls with #HengeDays.

Look up a building 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.

The day the sun hits that wall head-on.

Light you can put in the calendar

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Drive a street for the light

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Flatiron Building

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Three streets, live

Church Lane, Tappahannock, VA

Main Street, Mathews, VA

North Arthur Ashe Boulevard, Richmond, VA

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Release notes

Northeastern University Family Weekend, October 23 to 25, 2026: five buildings to photograph on campus and along Huntington Avenue

The weekend's schedule and the light

Part 1: the Northeastern campus

1 142-148 Hemenway Street

2 Renaissance Park Garage

Part 2: Huntington Avenue, the Fens and Fenway

3 Holy Trinity Orthodox Cathedral

4 Trilogy

5 Bower

How the list was made

How to read each entry

Sources

Features

Henge days for any building

Today

Along a street

Planner

Calendar feed and calendar files

Henge pages

Share links

Open data and accuracy