This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Dogon of the Bandiagara escarpment in Mali measure the largest turn of their ritual calendar not in years but in generations. The Sigui, a masked ceremony tied to the death and renewal of the community's mythical first ancestor, comes around roughly once every sixty years, an interval close enough to a human lifetime that the Dogon themselves understand it as a promise: everyone should live to see one Sigui, and the knowledge it carries is meant to reach a new generation before the elders who hold it are gone.
The ceremony is not one event but a journey. It moves from village to village along the escarpment in a procession that can take several years to complete before the whole cycle closes; the most recently finished round ran from 1967 to 1973, and the next is expected around 2032. Ritual elders and mask societies lead each stage, carrying forward secret knowledge that is handed down inside the ceremony itself rather than taught openly, while the wider community is drawn into the procession as it reaches each village in turn.
Much of what the outside world knows about Dogon cosmology comes from the French anthropologists Marcel Griaule and Germaine Dieterlen, who worked among the Dogon from 1931 and published their fullest account after fieldwork conducted between 1946 and 1950. Their reporting included a striking claim: that Dogon informants described the invisible companion star of Sirius, Sirius B, in terms that resemble the findings of modern astronomy, decades before such stars were common public knowledge. That claim spread widely outside anthropology as evidence of extraordinary ancient or externally transmitted knowledge.
It has not held up to closer scrutiny. Walter van Beek, who carried out a systematic restudy of the Dogon in the 1980s, published his findings in Current Anthropology in 1991 together with responses from other Africanist scholars. He found no trace of the specific Sirius B knowledge among Dogon informants who had not already worked with Griaule's own research team, and concluded that the claim most likely traces back to the research encounter itself rather than to pre-existing indigenous astronomy. The sixty year Sigui cycle and its procession of masks are not in question; the astronomical claim popularly attached to it is.
What remains, once the disputed claim is set aside, is still a striking piece of cosmic architecture: a rite that treats renewal not as an annual event but as something worth waiting a lifetime for, timed so that the handover of sacred knowledge from one generation to the next never has to skip a beat.