🌅 Hengefinder

Finds when the sun aligns with your street for a perfect sunset view (like Manhattanhenge).

• Enter an address to check for alignment with the sunset (or more specifically, alignment a little before sunset, the last moment the sun is at 50˚)
• Shows street bearing and sun alignment information
• Displays coordinates and next henge date (if there is one)

Installing & Running

Command Line Tool

pip install -r requirements.txt

That's it! Then just run with

python hengefinder.py

Web Application

To run the web interface:

1. Create a virtual environment with uv:

   uv venv

2. Activate the virtual environment:

   source .venv/bin/activate

3. Install dependencies:

   uv pip install -r requirements.txt

4. Run the web app:

   python app.py

The web app will be available at http://localhost:8080

Some sample addresses:

• 211 E 43rd St, NYC (Manhattanhenge location)
• 601-615 E 76th St, Chicago, IL
• 3131 Market St, Philadelphia, PA 19104

How It Works

The algorithm searches for dates when the sun's azimuth at 0.5 degrees elevation (shortly before sunset) aligns with the street's bearing.