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A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. [ 1 ] Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year. The diurnal cycle depends mainly on incoming solar radiation.
Diel vertical migration (DVM), also known as diurnal vertical migration, is a pattern of movement used by some organisms, such as copepods, living in the ocean and in lakes. The adjective "diel" (IPA: / ˈdaɪ.əl /, / ˈdiː.əl /) comes from Latin: diēs, lit. 'day', and refers to a 24-hour period. The migration occurs when organisms move up ...
A circadian rhythm (/ sərˈkeɪdiən /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment). Circadian rhythms are regulated by a circadian clock whose ...
Humans are diurnal, and organize their work and business mainly in the day [ a ] Diurnality is a form of plant and animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night. The common adjective used for daytime activity is " diurnal ". The timing of activity by an animal depends on a ...
A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, noon, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.
A full lunar day observed from the Earth, where orbital librationcauses the apparent wobble. A lunar dayis the time it takes for Earth's Moonto complete on its axisone synodic rotation, meaning with respect to the Sun. Informally, a lunar day and a lunar night is each approx. 14 Earth days. The formal lunar day is therefore the time of a full ...
Chronobiologyis a field of biologythat examines timing processes, including periodic (cyclic) phenomena in living organisms, such as their adaptation to solar- and lunar-related rhythms.[1] These cycles are known as biological rhythms. Chronobiology comes from the ancient Greek χρόνος(chrónos, meaning "time"), and biology, which pertains ...
The day-night cycle is one consideration for planetary habitability or the possibility of extraterrestrial life on distant exoplanets. [38] In general, shorter nights result in a higher equilibrium temperature for the planet. [39] On an Earth-like planet, longer day-night cycles may increase habitability up to a point. [40]
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