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 The other two are the Hyades and the Pleiades, and each of these clusters consists of hundreds of stars. In 2017, a massive star cluster was discovered only 10' from Sirius. It was discovered during a statistical analysis of Gaia data. The cluster is over a thousand times further away from us than the star system. The most commonly used proper name of this star comes from the Latin "Sīrius", from the Ancient Greek "Σείριος" ("Seirios", "glowing" or "scorcher"), although the Greek word itself may have been imported from elsewhere before the Archaic period, one authority suggesting a link with