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Tagssolar-observatory
2 places carry this tag, across every kind and continent it appears in.
🇵🇪 Peru · Archaeological wonder
Early Horizon–Early Intermediate 250–200 BCE (Initial Late Chavín to Wari interstice, Casma-Sechín tradition) · Casma–Sechín / Pampas ( north-central desert, precedent to Moche for Casma valley, not Inca)
Oldest solar observatory in Americas (250–200 BCE): 13 evenly spaced 2–5 m towers on 300 m ridge crest marking annual solar horizon from two enclosed observation pavilions (western fortress hill and…
🇩🇪 Germany · Megalith
Early Neolithic · Stichbandkeramik / Stroke-Ornamented ware
4900 BCE circular ditch and double timber palisade with solstice gates — Europe's oldest solar observatory.