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
The Sirius Mystery The former study also concluded that while a triple system for Sirius could not be fully eliminated, the probability was low. Temple's book and the debates that followed its release publicized the existence of the Dogon tribe among many New Age followers and proponents of ancient astronaut theories. Speculation about the Dogon on numerous websites is now mingled with fact, leading to wide misunderstanding among the public about Dogon mythology. Temple, however, has stated in the reprint of "The Sirius Mystery" (1999) that he in no way supports what he refers to as "sinister cults" that have been inspired by