Science: Graffiti with a Heavenly Message

The Southwest's old Indian rock carvings were observatories

As icy winds howled through the canyon, the people huddled beside their fires. The days had become short and cold, and the tribe's store of food was running low. Every day the people asked a tribal elder when the warming sun would return. But Sun Watcher, as he was called, sadly shook his head. The sun father, he said, was still journeying away. Then one day, when it seemed as if the far-off disc had barely risen above the horizon, Sun Watcher's wizened face broke into...

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