Dog days sometimes used for the lethargic summer markets. Various computations of the dog days have placed their start anywhere from 3 July to 15 August and lasting for anywhere from 30 to 61 days. They may begin or end with the cosmical rising or heliacal rising of either Sirius in Canis Major or Procyon (the "Little Dog Star") in Canis Minor and vary by latitude, not even being visible throughout much of the Southern Hemisphere. Sirius observes a period of almost exactly 365¼ days between risings, keeping it largely consistent with the Julian but not the Gregorian calendar; nonetheless, its dates
Sirius four Galilean moons of Jupiter and the rings of Saturn. This has been the subject of controversy and speculation. Doubts have been raised about the validity of Griaule and Dieterlein's work. In a 1991 article in "Current Anthropology" anthropologist Walter van Beek concluded after his research among the Dogon that, "Though they do speak about "sigu tolo" [which is what Griaule claimed the Dogon called Sirius] they disagree completely with each other as to which star is meant; for some it is an invisible star that should rise to announce the "sigu" [festival], for another it is Venus that, through