The Second Pass was the time period during which Thread fell for the second time since the planet was colonized. It lasted for a span of 46 turns.

The leaders of Pern at the end of the First Interval were concerned that future generations would forget about Thread during the intervals and they sought to find ways to preserve information for the future. By the time the Second Pass had begun, the Star Stones and Eye Rocks had been positioned at all six weyrs.

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