# Henge days for a building

This page computes its dates in the browser when it is opened, and keeps a summary for 60 days afterwards so that links to it can show them. Nobody has opened this one recently, so there is nothing stored to tell yet. Open https://hengedays.com/at/38.85526,-77.29279?b=osm%2Fway%2F375880005&q=Blenheim+House%2C+3610+Old+Lee+Highway%2C+Fairfax%2C+VA in a browser, then ask again.

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Every date and time is computed from a building outline in OpenStreetMap and the position of the sun, never checked on the ground. Hills, trees and other buildings can block a low sun. Treat each date as a plan to confirm. See https://hengedays.com/terms.md.