Hengefinder maps sun- and moon-framed city streets worldwide

Hengefinder is an app that predicts moments when the sun or moon lines up with city streets or buildings, creating a “henge” frame. Using astronomical calculations plus road data, it delivers instant results worldwide, showing sunrise, sunset, moonrise, and moonset for any place. Available on iPhone, Android, and the web, it stems from open-source code by Victoria Ritvo and highlights the real-world complexities of modeling roads, latitude/longitude, and the nuanced definition of “sunset.”