echo/neutra AVERAU 39 Moon phase Blue

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  echo/neutra AVERAU 39 Moon phase Blue

  The moon completes its lunar cycle in 29 days, 12 hours, 44 minutes, and 2.8 seconds. Since the center wheel makes one rotation per hour, a series of gear ratios (forming a reducing gear train) can be used to transition from one hour to approximately one lunar cycle.

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