PIX4590972: Constellation of the Great Dog - Constellation of Canis Major - Sirius, the bright star on this image is the brightest star in the sky. Canis Major (the Greater Dog) is one of two dogs accompanying Orion the hunter across the sky. The other is Canis Minor. The constellation figure is ancient, and was one of 48 constellations mentioned by Ptolemy (83 - 161 AD), no doubt reflecting earlier ideas. The modern stick figure joining the brightest stars (above) certainly has a very doggy appearance. The brightest star in the sky is here, Sirius, the Dog Star, so called because its emanations were thought to affect dogs in the heat of summer, the 'Dog Days' when the star is in the same part of the sky as the Sun. Sirius is bright because it is only 8.6 light years from the Sun and it is in any case it is an intrinsically bright star, 25 times more luminous than the Sun / Bridgeman Images
BON83304: Section of papyrus inscribed with cursive hieroglyphs with the text of the eleventh section of the Book of Amtuat describing the birth of the sun-god into the sky at day-break, found in the plinth of a wooden Ptah-Sokar-Osiris figure (see 83305), Egyptian, 21st-22nd Dynasty, c.900 BC / Bridgeman Images