This is a list of recurring . See also Index of wave articles, Time, and Pattern.
Atomic clock – Calendar – Chinese calendar – Computus – Diwali – Ephemeris time – Hertz – Intellectual history of time – Julian date – Season
Astronomy – CNO cycle – Eclipse cycle – Eclipse – Full moon cycle – Galactic year – Great Year – Lunar phase – Mesoamerican calendars – Metonic cycle – Milankovitch cycles – Mira – Moon – Nutation – Orbit – Orbital period – Saros cycle – Sothic cycle – Secularity – Sidereal year – Sunspot – Tide – Tropical year – Year