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This is a list of recurring cycles. See also Index of wave articles, Time, and Pattern.

Planetary cycles

Organic cycles

Agricultural cycles

Agricultural cycle – Carbon cycle – Crop rotation – Fertile Crescent – Harvest – Nitrogen cycle – Organic farming – Phosphorus cycle – Season – Sulfur cycle – Soil degradation – Sustainable industries – Water cycle

Biological and medical cycles

Alternation of generations – Beta oxidation – Bioelectricity – Biological pest control – Biological rhythm – Bipolar disorder – Cardiopulmonary resuscitation – Calvin–Benson cycle – Cell cycle – Chronobiology – Citric acid cycle – Circadian rhythm – Clinical depression – Digestion – Ecology – Feedback – Infradian rhythm - Life cycle – List of biochemistry topics – Marine biology – Menstrual cycle – Neurofeedback – Non-Hodgkin lymphoma – Organic farming – Periodical cicadas – Polymerase chain reaction – Soil degradation – Stomach cancer – Triage – Ultradian rhythm - Urea cycle – Zygote

Brain waves and cycles

Bioelectricity – Circadian rhythm – Consciousness – Electroencephalography – Neurofeedback – Persistent vegetative state – Sjögren's syndrome – Sleep - Ultradian rhythm

Physics cycles

Cyclic process – Carnot cycle – Double-slit experiment – Dynamic theory of gravity – Physics of music – Resonance – Sonoluminescence – Speed of light – Sunspot

Mathematics of waves and cycles

Almost periodic function – Amplitude modulation – Amplitude – Beat – Chaos theory – Cyclic group – Diffraction – Doppler effect – Eigenstate – Eigenvalue – Fibonacci sequence – Fourier series – Frequency domain – Frequency spectrum – Hamiltonian (quantum mechanics) – Harmonic oscillator – Huygens–Fresnel principle – Longitudinal wave – Mechanical wave – Navier–Stokes equations – Partial differential equation – Periodic function – Permutation – Phase (waves) – Physics of music – Power spectrum – Signal – Sine wave – Spectrum of an operator – Translational symmetry – Transverse wave – Wave equation – Wave–particle duality – Wave – Waveform

Electromagnetic spectrum

Absorption spectroscopy – Anders Jonas Ångström – Astronomical spectroscopy – Astronomy – Black body – Blazar – Bremsstrahlung – Caesium – Cherenkov radiation – Color – Diffraction – Digital signal processing – Direct-sequence spread spectrum – Dispersion (optics) – Eigenstate – Eigenvalue – Electromagnetic radiation – Electromagnetic spectroscopy – Electromagnetic spectrum – Electromagnetism – Emission line – Emission spectrum – FM broadcasting – Frequency domain – Frequency hopping – Frequency spectrum – Gamma-ray burst – Hamiltonian (quantum mechanics) – History of radio – Hue – Isotope – Light – Optical brightener – Orbits (complex dynamics) –Particle in a spherically symmetric potential – Piezoelectricity – Power spectrum – RADAR – Radio frequency – Radio – Radiocommunications Agency – Redshift – SETI – Spectrogram – Spectrometer – Spectroscopy – Spectrum analyzer – Sunyaev–Zel'dovich effect – Supernova – Telecommunication – Timbre – Very high frequency – Visible light – Visible spectrum – White noise

Sound waves

Acoustic theory – Acoustics – Aerodynamics – Amplitude – Anemometer – Audio feedback – Beat (acoustics) – Bugging – Cherenkov radiation – Cold fusion – Compressibility – Delay-line memory – Diffraction – Doppler effect – Echo sounding – Electronic filter – FTIR – Krakatoa – Loudspeaker – Mach number – Microphone – Ossicles – Pan pipes – Parabolic microphone – Phonetics – Phonon – Piezoelectricity – Psychoacoustics – Sawtooth wave – Shock wave – SID – Sonar – Sonic boom – Sonoluminescence – Soundproofing – Sound recording – Sound – Speech processing – Speed of sound – Sperm whale – Square wave – Subsonic – Subtractive synthesis – Synthesizer – Telephone – Transmission line – Triangle wave – Wave drag – Waveform

Miscellaneous cycles

Economic and business cycles

Business cycle – Inflation / Recession – Monetary policy – Virtuous circle and vicious circle – Kitchin cycle – Juglar cycle – Kuznets swing

Music and rhythm cycles

Harmonics – Interval cycle – Musica universalis – Music theory – Physics of music – Ring cycle – Rhythm – Song cycle

Political cycles

Election Cycle – Campaign Cycle – Cycle between political extremes – American political cycle

Religious, mythological, and spiritual cycles

Astrology – Mantra – Numerology – Pratītyasamutpāda – Samhain – Sexagenary cycle – Surya

Social and cultural cycles

Dynastic cycle – Kondratiev wave – Social cycle theory – Tytler cycle – Strauss–Howe generational theory

Military and war

War cycles - Joshua S. Goldstein - George Modelski

Literature

Literature cycle – Play cycle – Sonnet cycle

List of cycles

Planetary cycles

Astronomical cycles

Climate and weather cycles

Geological cycles

Organic cycles

Agricultural cycles

Biological and medical cycles

Brain waves and cycles

Physics cycles

Mathematics of waves and cycles

Electromagnetic spectrum

Sound waves

Miscellaneous cycles

Economic and business cycles

Music and rhythm cycles

Political cycles

Religious, mythological, and spiritual cycles

Social and cultural cycles

Military and war

Literature

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