Cyclical Time in the World's Religions and Spiritual Traditions

Seven short pieces, one per tradition, written so each can be pasted as its own post in the Spiritual/Religious/Esoteric section. Where a tradition states an actual numeric period, it's called out explicitly.

Hinduism (and its Vedic root, Brahmanism)

No tradition states its cycles more precisely than the Hindu Yuga system. A Mahayuga ("great age") is built from four descending ages: Satya/Krita Yuga (1,728,000 years), Treta Yuga (1,296,000 years), Dvapara Yuga (864,000 years) and Kali Yuga (432,000 years) — a 4:3:2:1 ratio totalling 4,320,000 years. We are held to be living inside the current Kali Yuga, traditionally dated from 3102 BCE.

The scale then nests upward: 1,000 Mahayugas = 1 Kalpa (4.32 billion years), reckoned as a single "day" in the life of the god Brahma; an equal-length "night" (Pralaya, cosmic dissolution) follows, giving an 8.64-billion-year day-night cycle. 360 such days make a year of Brahma, and Brahma's full lifespan is 100 of his years — roughly 311 trillion human years — after which the universe dissolves entirely (Mahapralaya) before a new Brahma begins the cycle again. Within each Kalpa, 14 Manvantaras (each c. 306,720,000 years) further subdivide cosmic history.

This is cyclical time taken about as far as it can go: no absolute beginning, no final end, just nested wheels within wheels — a structure early 20th-century Indologists were struck by precisely because of how it resembles a modern oscillating-universe cosmology, long before that was a scientific idea.

Buddhism

Buddhism inherited the Kalpa from its Vedic environment but defines it more poetically than numerically. One popular version: imagine a solid rock cube one cubic yojana in size (roughly 11–15 km per side); once a century, a heavenly being brushes it once with a silk cloth. The time it takes to wear the rock away entirely is one Kalpa. A second version imagines a walled city of similar size filled with mustard seeds, one seed removed per century.

Buddhist cosmology also describes a repeating cycle of world-formation and destruction (by fire, water and wind in turn) over vast, unspecified stretches of "great kalpas," each divided into 4 "incalculable kalpas" of 20 "small kalpas" apiece — a nested structure similar in spirit to the Hindu system.

The more famous cyclical image, however, is the Bhavacakra, the Wheel of Life: the repeating cycle of birth, death and rebirth (samsara) driven by karma, with no fixed period attached — escape (nirvana) rather than a numeric cycle is the point. The Kalachakra ("Wheel of Time") Tantra, by contrast, is explicitly cycle-obsessed: it links external astronomical cycles (a 60-year Jovian calendar cycle, lunar and solar reckonings), the internal cycles of breath and subtle energy in the body, and "other" cycles of tantric practice, treating all three as reflections of one underlying structure — plus its well-known prophecy of a future golden age centred on the hidden kingdom of Shambhala.

Christianity

Mainstream Christian theology is officially linear — creation, fall, redemption, a single final judgement — but several genuinely cyclical elements sit inside that frame. The clearest is the simplest: the seven-day week, sabbath-anchored, running continuously and without regard to any astronomical cycle since it was fixed in antiquity.

More elaborate is the Jubilee cycle from Leviticus 25: seven cycles of seven years (49 years), followed by a fiftieth "Jubilee" year of debt-release, land-return and rest — an explicitly stated 49/50-year social-economic cycle, unusual for being legislated rather than merely observed.

Patristic and medieval writers also floated the "Great Week" or "Cosmic Week" theory: taking 2 Peter 3:8 ("a day with the Lord is as a thousand years") together with the six days of creation, they proposed a 6,000-year span of world history followed by a millennial 1,000-year "seventh day" of rest — a 7,000-year total cycle. Versions of this idea (associated with figures like Irenaeus and later apocalyptic writers) fed centuries of end-times date-setting. Separately, the 19-year Metonic cycle was adopted by the early church, via the Alexandrian computus, to calculate the date of Easter each year — a genuinely astronomical cycle embedded in liturgical practice.

Islam

Islamic time-reckoning is built on an explicitly cyclical, purely lunar calendar of 12 months (no leap month), which drifts against the solar year by about 11 days annually — meaning the Islamic and Gregorian calendars realign roughly every 33 solar years (33 lunar years ≈ 32 solar years), a stated period sometimes called the "cycle of the moon years."

Pre-Islamic Arab thought had its own fatalistic concept of cyclical, impersonal time called dahr, which the Qur'an and later theologians pushed back against in favour of a linear, purposeful history culminating in resurrection and judgement — so, similar to Christianity, the orthodox theology is linear even though the calendar under it is cyclical.

One specific recurring-renewal idea does carry a stated period: a well-known hadith holds that God sends a Mujaddid (renewer of the faith) at the turn of every Islamic century — a claimed 100-year (Hijri) cycle of religious revival, which later scholars have applied retrospectively to identify a "reviver" for each century of Islamic history.

Chinese Traditions (Taoism, Confucianism, Folk Religion)

Chinese cosmology is arguably the most cycle-native of all the major traditions. At the foundation is the alternation of Yin and Yang, and the generating/overcoming cycles of the Wu Xing (Five Phases: Wood, Fire, Earth, Metal, Water), each phase produced by one neighbour and controlled by another, forming two interlocking five-step cycles used to model everything from seasons to dynastic succession.

The I Ching (Book of Changes) systematises change itself into 64 hexagrams, traditionally read as a complete, cyclical map of transformation — not a numeric period, but a structural one, hugely influential on later Chinese cosmological thinking (and, incidentally, on Leibniz's binary arithmetic).

Concretely numeric is the sexagenary (60-year/60-day) cycle, formed by combining the 10 Heavenly Stems with the 12 Earthly Branches, in continuous use for calendrical and astrological purposes since at least the Shang dynasty (c. 1250 BCE) — one of the longest continuously-used numbered cycles in the world. On a civilisational timescale, the dynastic cycle theory (tied to the Confucian "Mandate of Heaven") holds that dynasties predictably rise, flourish, decay through corruption, and fall to be replaced — a recurring political-cycle pattern rather than a fixed period, but one Chinese historians have applied self-consciously for over two thousand years.

African Traditions

The best-known (and most contested) cycle claim from Africa comes from the Dogon people of Mali. According to the 1930s–40s fieldwork of French anthropologists Marcel Griaule and Germaine Dieterlen, Dogon priests described Po Tolo ("Digitaria star"), an invisible, extremely dense companion to Sirius, orbiting it in roughly 50 years on an elliptical path — closely matching the real Sirius B, whose orbital period is 50.1 years, confirmed by Western astronomy only in the 20th century. The Dogon Sigui ceremony, marking generational renewal, is held roughly every 60 years. The claim is genuinely disputed: critics (notably anthropologist Walter van Beek, who could not find the tradition among the wider Dogon population decades later) argue the knowledge may trace to 20th-century contact with European visitors passing through Griaule's own informants, rather than to deep tradition — it's included here as a live, unresolved case rather than settled fact.

Elsewhere on the continent, the Akan peoples of Ghana use a 7-day naming cycle (Adinkra day-names, one soul-name per day of the week a person is born), and the Yoruba Ifa divination system is built on 256 Odu (16 principal Odu, each combined with the other 16), forming a large but fixed cyclical set of divinatory patterns consulted via a repeating cast-and-read procedure. More broadly, many African cosmologies (Akan, Yoruba, and others) treat time as cyclical rather than linear at the level of ancestry and generation — the dead cycling back into new births within the lineage — rather than expressing it as an astronomical period.

NZ Māori

Māori tradition runs on two nested natural cycles. The Maramataka is a lunar calendar: each of the roughly 30 nights of the moon's cycle has its own name and its own guidance for planting, fishing and other activity, based on observed correlations between moon phase and the behaviour of tides, fish and plants — a working 29.5-day applied cycle still actively used today.

Layered on top is the annual cycle marked by Matariki, the heliacal rising of the Pleiades star cluster in midwinter (late June), which signals the Māori New Year — now also a national public holiday in New Zealand, one of the few places where an ancient stellar cycle has been directly written into a modern civil calendar.

At the cosmogonic scale, Māori tradition describes reality unfolding through a sequence of states — Te Korekore (the realm of potential, "the nothingness that is everything"), Te Pō (night/darkness, itself often described in multiple stages), and Te Ao Mārama (the world of light) — not a numerically dated cycle, but a structural progression from undifferentiated potential to the ordered, living world, echoed in whakapapa (genealogy), which threads every living person and every natural feature back through this same sequence to common origin.