Wednesday, July 7, 2010

The Dog Days of Summer

Have you heard that expression before? I have, and I always associated it with a very hot, humid, muggy summer season. But I wondered why these days were called "the dog days of summer"?

I asked some of the brothers and sisters if they knew what that expression meant. Although they were very familar with the phrase, they didn't know its meaning. So of course one of Raven's Delights is to find out the meaning of things and to blog about it.

What Are The Dog Days of Summer ?

Some say it signifies hot sultry days "not fit for a dog." Others claim its the weather in which dogs go mad.

Everyone knows that the “dog days of summer” occur during the hottest and muggiest part of the season. Webster defines “dog days” as...

1 : the period between early July and early September when the hot sultry weather of summer usually occurs in the northern hemisphere.

2 : a period of stagnation or inactivity

But where does the term come from? Why do we call the hot, sultry days of summer “dog days?”

In ancient times, when the night sky was unobscured by artificial lights and smog, different groups of peoples in different parts of the world drew images in the sky by “connecting the dots” of stars. The images drawn were dependent upon the culture:

The Chinese saw different images than the Native Americans, who saw different pictures than the Europeans. These star pictures are now called constellations, and the constellations that are now mapped out in the sky come from our European ancestors.

They saw images of bears, (Ursa Major and Ursa Minor), twins, (Gemini), a bull, (Taurus), and others, including dogs, (Canis Major and Canis Minor).

The brightest of the stars in Canis Major (the big dog) is Sirius, which also happens to be the brightest star in the night sky. In fact, it is so bright that the ancient Romans thought that the earth received heat from it. Look for it in the southern sky (viewed from northern latitudes) during January.

In the summer, however, Sirius, the “dog star,” rises and sets with the sun. During late July Sirius is in conjunction with the sun, and the ancients believed that its heat added to the heat of the sun, creating a stretch of hot and sultry weather. They named this period of time, from 20 days before the conjunction to 20 days after, “dog days” after the dog star.

The conjunction of Sirius with the sun varies somewhat with latitude. And the “precession of the equinoxes” (a gradual drifting of the constellations over time) means that the constellations today are not in exactly the same place in the sky as they were in ancient Rome.

Today, dog days occur during the period between July 3 and August 11. Although it is certainly the warmest period of the summer, the heat is not due to the added radiation from a far-away star, regardless of its brightness. No, the heat of summer is a direct result of the earth's tilt.

So as you can see the summer heat has nothing to do with Sirus, and all to do with the tilt of the earth toward the sun.

I always like to know how things got their name. Now you know too!

So enjoy the rest of these "dog days of summer" for they will be quickly gone before we know it.

This is Raven-as the crow flies!


  1. Well, it looks like the Dog Days of Summer have begun! Thank you. I learned something new. P.S. Love the pictures!!

  2. Thanks to your help Sparrow, I am getting the hang of it. But just when I think I got it, I lose it! There is so much to learn, and so little time.