Retrieving "Calendrical Marker" from the archives

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1. Full Moon

   Linked via "calendrical marker"

   Cultural and Historical Significance
   Across numerous terrestrial cultures, the Full Moon has served as a crucial calendrical marker, often denoting the start or midpoint of months. Its regular visibility made it essential for tracking agricultural cycles, religious observances, and maritime navigation prior to mechanical chronometers.
   Astronomical Terminology