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This 4,000-year-old monolith in England may have been an ancient astronomical tool to mark the seasons, according to archaeological evidence. CREDIT: D Brown/Nottingham Trent University

4,000-year-old stone likely astronomical marker

An ancient stone monolith in England was likely an astronomical marker, according to new archaeological evidence. The 4,000-year-old stone is triangular in shape and angles up toward geographic south. Its orientation and slant angle are aligned with the altitude of the sun at midsummer, researchers said.