City henge · Portugal

Rua da Constituição: Porto

The dates below show when the rising or setting sun lines up with Rua da Constituição in Porto, computed geometrically with the same engine as the interactive map. This is a geometry-based candidate rather than a named local tradition.

This entry is a geometry-verified proposal, not an established local tradition. The pin marks the relevant street corridor rather than an exact standing position. Weather, buildings, terrain, and access can affect what is visible.

Analysis data: registry.opendata.aws · openstreetmap.org

Streethenge calculates geometric solar and lunar alignments. Visibility on site depends on weather, buildings, trees, terrain, safety, and access.