sirius

WTF Fun Fact 13439 – The Dog Days of Summer Explained


Does the phrase “Dog Days of Summer” conjure images of lethargic canines lazing in the heat? Well, the origins of this term reach far beyond our four-legged friends and into space.

What are the dog days of summer?

Ok, technically, it does have to do with a dog – Sirius, the Dog Star. Sirius is part of the constellation Canis Major, and it’s the brightest star in the Earth’s night sky.

The term “Dog Days” stems from the ancients, both Greeks and Romans, who noticed the coincidence of the hottest time of the year with the period when Sirius rose and set with the Sun. They hypothesized that the added radiance of Sirius was the cause of the intensified summer heat. Thus the phrase “Dog Days” in reference to Sirius’s constellation.

But the “Dog Days” are more than just a celestial phenomenon and a synonym for summer swelter. They have cultural and historical significance dating back thousands of years. The Greeks, for instance, saw the period as a time of potential disaster, heralding fever, catastrophe, and even the downfall of empires.

Wobbling dog days

Fast forward to the present, and the “Dog Days” still persist in our lexicon. However, due to a phenomenon called precession (the slow wobble of Earth’s rotational axis), the dates during which Sirius rises and sets with the Sun have slowly shifted over centuries. Yet, the phrase “Dog Days” remains tethered to the heart of the summer. It’s recognized in the Northern Hemisphere primarily from July 3 to August 11.

The warmest days of summer, those long afternoons that stretch languidly towards the evening, are connected to a distant cosmic spectacle occurring about 8.6 light-years away. That is the beauty of astronomy and the power of human observation, linking us to the stars and the seasons in unexpected ways.

So, next time you’re feeling the heat of summer bearing down, spare a thought for Sirius and its ancient connection to these sultry days. The “Dog Days” are a cosmic link, a reminder that even on the hottest days of summer, we are all under the same sky.

— WTF fun facts

Source: “Stars and canines collide in ‘dog days’” — Christian Science Monitor

WTF Fun Fact 13423 – Egyptian New Year

Ancient Egyptian New Year took place right after the summer solstice. But it’s all because of the stars.

How did the ancient Egyptian New Year work?

In ancient Egypt, a star took center stage in the night sky right after the summer solstice. Not just any star, but Sirius, the brightest in our galaxy. Its annual appearance sparked a series of critical events. The Nile River would flood, replenishing the arid land with fresh, fertile soil. An agricultural resurgence followed, as did the beginning of a new year in the Egyptian calendar. That’s why Sirius was also referred to as the “Nile Star.”

New beginnings

So, what was the connection between the summer solstice, Sirius, and the Nile’s annual flooding? Each event seemed to occur in a synchronized manner. The solstice, marking the longest day of the year, was like the opening act. It was the signal, the green light, that Sirius was about to make its grand appearance.

Soon after the solstice, just as the Earth began its tilt away from the sun, Sirius would rise above the eastern horizon. The Egyptians saw this as no coincidence. In their view, Sirius had a profound influence on the Earth. It controlled the ebbs and flows of the mighty Nile.

In essence, the Egyptians saw the world around them as a mirror of the cosmos. Everything was interconnected. The rise of Sirius, the flooding of the Nile, the abundance of crops – these were not isolated events but part of a grand, divine plan. They believed Sirius triggered the Nile flood. The life-bringing waters were a celestial gift, ushering in a season of fertility and growth.

Following the cosmos

With the rise of Sirius linked to such an essential natural event, it’s no surprise the Egyptians incorporated it into their calendar. The Egyptian New Year was not only a temporal marker but a time of celebration, renewal, and anticipation for the bountiful harvest that lay ahead.

The fascinating link between Sirius, the summer solstice, and the flooding of the Nile demonstrates the Egyptians’ profound understanding of astronomy and its influence on their environment. They recognized patterns, made predictions, and used this knowledge to their advantage.

And this is yet another reminder that calendars do not arbitrarily mark time but are instead rooted in the significant events of their world.

— WTF fun facts

Source: “SUMMER SOLSTICE: 3 HISTORICAL LOCATIONS THAT MARK THE ORIGINAL HOLIDAY” — Inverse