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 Chaucer's essay "Treatise on the Astrolabe", it bears the name Alhabor, and is depicted by a hound's head. This name is widely used on medieval astrolabes from Western Europe. In Sanskrit it is known as "Mrgavyadha" "deer hunter", or "Lubdhaka" "hunter". As Mrgavyadha, the star represents Rudra (Shiva). The star is referred as "Makarajyoti" in Malayalam and has religious significance to the pilgrim center Sabarimala. In Scandinavia, the star has been known as "Lokabrenna" ("burning done by Loki", or "Loki's torch"). In the astrology of the Middle Ages, Sirius was a Behenian fixed star, associated with beryl and juniper. Its