Despite the ring density, variation in width coincides with irregular rainfall cycles.

Economic Cycles argues that a rainfall cycle affects agricultural markets, which affect industrial markets.

Generating Economic Cycles traces the rainfall cycle back to an astronomical cycle.

Hurricanes, continental drift, rainfall cycle - it's all there.

In 1908 Nevill wrote an article on the rainfall in Natal for the Natal Agricultural Journal, in which he identified an 18-year rainfall cycle.

Although the Caiman has not been studied in-depth, scientists have learned that their mating cycles (previously thought to be spontaneous or year-round) are linked to the rainfall cycles and the river levels, which increases chances of survival for their offspring.

The Caretaker reveals that he was part of an alien race whose technology had long ago accidentally caused the rainfall cycle on the Ocampa planet to become disrupted and leaving it arid, due to the destruction of that particular M-class planet's atmospheric nucleogenics.

Gunungkidul owned agriculture is largely rain-fed dry land ( 90%) depending on the climate especially rainfall cycle.