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Public datasets that show “cyclical” behavior

Open Data Asked on December 4, 2021

I initially posted this question here

https://datascience.stackexchange.com/questions/78139/public-datasets-that-show-cyclical-behavior

but was redirected here. I am looking for any publicly available dataset that has a "cyclical" structure to it (limit cycles), in the sense that if I plot the data in a certain way, a loop becomes visible. A good example of this would be the Lotka-Volterra predator-prey model, which has a very pronounced cycle, shown below. Are there any other good examples that demonstrate this?

Predator-prey picture

One Answer

Sunrise (or sunset) vs days distant (i.e., 0-183 days) from equinox yields a nice cycle, and if you repeat over many years you see the effects of leap years and leap centuries. US Naval Observatory would be a good source for that, or any of the various calculated times (from many sources) if calculated values are OK.

Other astronomical data have similar cycles.

Answered by C8H10N4O2 on December 4, 2021

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