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 a different position, appears as "sigu tolo". All agree, however, that they learned about the star from Griaule." Noah Brosch explained in his book "Sirius Matters" that the cultural transfer of relatively modern astronomical information could have taken place in 1893, when a French expedition arrived in Central West Africa to observe the total eclipse on April 16. In the religion of the Serer people of Senegal, the Gambia and Mauritania, Sirius is called "Yoonir" from the Serer language (and some of the Cangin language speakers, who are all ethnically Serers). The star Sirius is one of the most important