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En kalender på 365 dage, haab, solår – består af 18 perioder à 20 dage – og fem dage til overs; wayeb. En kalender på 360 dage, tun. En kalender på 260 dage, tzolkin, hellig kalender. En kalender på 18.980 dage (52 år), en cyklus.
Jordens geologiske udvikling kan beskrives i en række kredsløb styret af de fysiske og kemiske processer, der udspiller sig ved jordoverfladen og i Jordens indre. Forløbet af de geologiske processer er især knyttet til tilstedeværelsen af vand og til den temperatur og det tryk, som processerne foregår under.
The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone.
The water cycle describes the processes that drive the movement of water throughout the hydrosphere. However, much more water is "in storage" (or in "pools") for long periods of time than is actually moving through the cycle. The storehouses for the vast majority of all water on Earth are the oceans.
Solar activity, driven by both the solar cycle and transient aperiodic processes, governs the environment of interplanetary space by creating space weather and impacting space- and ground-based technologies as well as the Earth's atmosphere and also possibly climate fluctuations on scales of centuries and longer.
In the Babylonian and Hebrew lunisolar calendars, the years 3, 6, 8, 11, 14, 17, and 19 are the long (13-month) years of the Metonic cycle. This cycle forms the basis of the Greek and Hebrew calendars. A 19-year cycle is used for the computation of the date of Easter each year. The Babylonians applied the 19-year cycle from the late sixth ...
El ciclo hidrológico o ciclo del agua es el proceso de circulación del agua entre los distintos compartimentos que forman la hidrósfera. Se trata de un ciclo biogeoquímico en el que hay una intervención mínima de reacciones químicas, porque el agua solo se traslada de unos lugares a otros, o cambia de estado físico. 1 .
