the best example of a noncyclic event is
1. A CHANGE OF SEASONS
2. A VOLCANIC ERUPTION
3. A PHASE CHANGE OF THE MOON
4. AN APPARENT STAR MOVEMENT
2. A volcanic eruption
I will go for "the volcanic eruption" and after that for " the season change".
2. or 4.
Volcanoes sometimes only erupt once.
Stars usually orbit something but their local movementg is not cyclical.
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