Circadian rhythms occur on a recurring basis with a frequency of approximately 24 hours.
They are largely governed by the light-dark cycle mediated by the Earth’s rotation around the sun.
Homo sapiens has historically largely been an equatorial-dwelling species, so this amounted to, on an annually averaged basis, about 12-hours light/12-hours dark; with longer days in summer and longer nights in winter.
Diurnal and seasonal temperatures fluctuate as well.
Implications on metabolic health, diabetes risk, insulinemia, etc., etc.
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