Dog Days

I was curious about the term "dog days", so I looked it up. It's from the time of the Roman Empire, and was somewhere around the period of July 3 to August 11, which are the generally the hottest days of the year. That's when the star Sirius in the constellation Canis Major (big dog) would appear near sunrise. That was true back then, but due to the wobble of the Earth (precession) Sirius rises later in the year. This wobble, which is a 26,000 year cycle changes the time constellations rise, the stars that can be considered the north star, and pretty well destroys the wizardry of astrology. That, and destroys my original conception of how the dog days of summer were when dogs did as little as possible, laid under the porch, and waited for the cool of the evening to ease the brutal heat.