‘Hengefinder is an app that, given times and places, can help you experience “stunning moments when the sun or moon aligns perfectly with city streets and buildings.” A “henge” is when the sun or moon is perfectly framed by a street or appears to sit on top of a building … Astronomical calculations combined with road data deliver instant results. Works worldwide. Sunrise, sunset, moonrise, and moonset—all at your fingertips. It’s available for iPhone and on the Google Play Store, but is based on open-source software posted to Github by Victoria Ritvo. It’s on the web at hengefinder.rcdis.co; my street gets henged in September, weather permitting!…’ (Rob Beschizza via Boing Boing)