= Megalithic yard
{wiki=Megalithic_yard}
The Megalithic yard is a proposed unit of measurement that some researchers believe was used by prehistoric stone builders in the British Isles, particularly during the Neolithic and Bronze Age periods. The concept was popularized by the archaeologist Alexander Thom in the 20th century. Thom measured various megalithic structures, such as stone circles and standing stones, and suggested that they were built using a consistent unit of length, which he termed the "Megalithic yard.
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