Wednesday, August 12, 2009

Dog Days of Summer

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The phrase Dog Days or "the dog days of summer", refers to the hottest, most sultry days of summer.

Dog Days can also define a time period or event that is very hot or stagnant, or marked by dull lack of progress.

The term "Dog Days" was used by the Greeks (see, e.g., Aristotle's Physics, 199a2), as well as the ancient Romans (who called these days caniculares dies (days of the dogs)) after Sirius (the "Dog Star", in Latin Canicula), the brightest star in the heavens besides the Sun. The dog days of summer are also called canicular days.

The Dog Days originally were the days when Sirius, the Dog Star, rose just before or at the same time as sunrise (heliacal rising), which is no longer true, owing to precession of the equinoxes.

The Romans sacrificed a brown dog at the beginning of the Dog Days to appease the rage of Sirius, believing that the star was the cause of the hot, sultry weather.

Dog Days were popularly believed to be an evil time "when the seas boiled, wine turned sour, dogs grew mad, and all creatures became languid, causing to man burning fevers, hysterics, and phrensies" according to Brady’s Clavis Calendarium, 1813.

In Ancient Rome, the Dog Days extended from July 24 through August 24 (or, alternatively July 23-August 23). In many European cultures (German, French, Italian) this is still the period to be the time of the Dog Days.

The Old Farmer's Almanac lists the traditional timing of the Dog Days as the 40 days beginning July 3 and ending August 11, coinciding with the ancient heliacal (at sunrise) rising of the Dog Star, Sirius. These are the days of the year when rainfall is at its lowest levels.

The period from July 23 to August 23 is called "Rötmånad" in Sweden and "Mätäkuu" in Finland, both literally meaning "rotting-month", due to the risk of foodstuff spoiling due to the high temperature.

The phrase is mentioned in the short story "The Bar Sinister" by Richard Harding Davis. The main character, who is a street dog, explains "but when the hot days come, I think they might remember that those are the dog days, and leave a little water outside in a trough, like they do for the horses."

In recent years, the phrase "Dog Days" or "Dog Days of Summer" have also found new meanings.

The term has frequently been used in reference to the American stock market(s). Typically, summer is a very slow time for the stock market, and additionally, poorly performing stocks with little future potential are frequently known as "dogs.

A casual survey will usually find that many people believe the phrase is in reference to the conspicuous laziness of domesticated dogs (who are in danger of overheating with too much exercise) during the hottest days of the summer.




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