day-night cycle
Light and darkness
The day-night cycle is the regular alternation between daylight and darkness caused by Earth's rotation, typically lasting about 24 hours.
The term appears in biology discussing circadian rhythms, in video games where virtual worlds simulate passing time, and in discussions of other planets: Mars has a day-night cycle similar to Earth's.
- circadianDaily biological cycle
- body clockInternal time-keeping system
- internal clockBody's innate timing mechanism
- sunriseMorning light's arrival
- first lightEarliest morning brightness
crack of dawn · sunset · dusk · dawn · golden hour · nocturnal · diurnal · rhythm · rotation · earth · solar · lunar · sleep · wake · melatonin · biological · clock · time zone
- cyclescircle of life, period, rhythms, oscillations, full circle
- driving simulationsteering wheel, gas pedal, brake pedal, speedometer, gear shift
- natural cyclescircadian rhythm, seasons, tides, moon phases, circadian rhythms
- Earthearth, Earth, globe, continent, axis
- gamingvideo games, buff, games, PlayStation 4, gameplay
- simulation gamesThe Sims, character creation, virtual pet, tycoon game, dating sim
day-night cycleeternal night
Darkness without end
polar day · polar night · midnight sun · timelessness · stasis
day-night cycleartificial lighting
Non-solar illumination indoors
night, cycle, nights, cycles, nightly, cyclic, cyclical, cycling, cyclist