A century ago, Serbian scientist Milutin Milankovitch hypothesized the long-term, collective effects of changes in Earth’s position relative to the Sun are a strong driver of Earth’s long-term climate, and are responsible for triggering the beginning and end of glaciation periods (Ice Ages). Others are human-produced, like growing and harvesting crops, musical rhythms or economic cycles.Ĭycles also play key roles in Earth’s short-term weather and long-term climate. Some are natural, such as the change of the seasons, annual animal migrations or the circadian rhythms that govern our sleep patterns. There are hundreds of different types of cycles in our world and in the universe. Our lives literally revolve around cycles: series of events that are repeated regularly in the same order.
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