+**29d** often refers to a period of twenty-nine days, a duration significant in various natural and calendrical cycles. It closely approximates the [Lunar Cycle](/wiki/Lunar_Cycle) and can denote the length of certain [Calendars](/wiki/Calendar).
+## See also
+- [Moon Phases](/wiki/Moon_Phases)
+- [Synodic Period](/wiki/Synodic_Period)
+- [Month](/wiki/Month)
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