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Rare, because moonlight is far dimmer than sunlight

Periodicity records how regularly, or irregularly, a natural phenomenon actually recurs. Wikipedia notes auroras result from "disturbances in the Earth's magnetosphere caused by enhanced speeds of solar wind from coronal holes and coronal mass ejections," events tied to the Sun's own activity cycle rather than a fixed calendar. This dimension separates phenomena that recur on a predictable schedule from those that strike unpredictably.

Rare, because moonlight is far dimmer than sunlight
Sources
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration
  • Contains: Aurora
  • Contains: Monsoon
  • Contains: Tides
  • Contains: Ocean Currents
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Encyclopaedia Britannica
Encyclopaedia Britannica, Inc.Contains: WildfireView the Source
What Is Ecological Succession? (University of Chicago News)
University of Chicago NewsContains: SuccessionView the Source
Trophic Cascade (Wikipedia)
WikipediaContains: Trophic CascadeView the Source
Camouflage (Wikipedia)
WikipediaContains: CamouflageView the Source
Estivation (Wikipedia)
WikipediaContains: EstivationView the Source
Coral Bleaching (NOAA Ocean Service)
National Oceanic and Atmospheric AdministrationContains: Coral BleachingView the Source
Convergent Evolution (Wikipedia)
WikipediaContains: Convergent EvolutionView the Source
Defining Desertification (NASA Earth Observatory)
NASA Earth ObservatoryContains: DesertificationView the Source
Phosphorus Cycle (Wikipedia)
WikipediaContains: Phosphorus CycleView the Source
Ocean Acidification (NOAA Ocean Service)
National Oceanic and Atmospheric AdministrationContains: Ocean AcidificationView the Source
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