Skip to content
← City henges

City henge · Portugal

Geometry proposal

Rua da Constituição: Porto

Next

Sunset · Thursday, 3 September 2026

07:57 PM GMT+1 · Look toward W (279°)

Porto: sunset bearing across the year vs Rua da Constituição

240°250°260°270°280°290°300°S2026ONDJ2027FMAMJJASstreet axis 279.4°3 Sept9 Apr2 Septtoday3 Sept: sun sets at 281.0°, 1.6° off Rua da Constituição
The dashed line is the street. Where the sun's curve touches it are the henge days. Drag across the year to move the sun.

This is where the rising or setting sun lines up with Rua da Constituição in Porto.

The date above is the next time it happens, computed from the street's geometry. The windows further down list the full range of days the alignment holds.

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.

Sunset alignment windows

Sunrise alignment windows

Street corridors

  • Some modeled directions are obstructed. Use an unblocked alignment window and check local conditions before visiting.

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.

Sun alignment dates for Rua da Constituição: Porto