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 of Greek civilization, and the Epic of Gilgamesh, among other things. Temple's theory was heavily based on his interpretation of the work of ethnographers Marcel Griaule and Germaine Dieterlen. A substantial bulk of "The Sirius Mystery" consists of comparative linguistic and mythological scholarship, pointing out resemblances among Dogon, Egyptian and Sumerian beliefs and symbols. Greek and Arab myths and words are considered to a lesser extent. The "mystery" that is central to the book is how the Dogon allegedly acquired knowledge of Sirius B, the white dwarf companion star of Sirius A, invisible to the naked eye. Temple did not