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Today is the autumnal equinox— a day when the hours of the day are equal to the hours of the night. Thousands of years ago, ancient man kept track of these events by building tombs that contained large stones carved with solar symbols. This morning, in Cairn T, a megalithic tomb in Loughcrew, Ireland ( above left), the backstone of its chamber was illuminated by a beam of light at sunrise. The sun light shaped by the stones at the entrance, traveled down the passage and descended to the backstone while moving from left to the right illuminating the symbols (petroglyphs) carved into the stone. Right, is a painting of what the backstone at Cairn T looks like today as the sun moves across its surface.
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