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Dog days
The expression dog days refers to the hot, sultry days of summer, originally in areas around the Mediterranean Sea, and as the expression fit, to other areas, especially in the Northern Hemisphere. The coincidence of very warm temperatures in the early civilizations in North Africa and the Near East with the rising, at sunrise (i.e., the heliacal rising), of the Orion's dog, the dog star Sirius, led to the association of this phrase with these conditions, an association that traces to the Egyptians and appears in the ancient written poetic and other records of the Greeks (e.g., Hesiod and Aratus) and the later Romans (including Homer, in ''The Iliad''). In such geographical areas as these, and others globally with similar latitude and climate, the dog days of summer are most commonly experienced in the months of July and August, which typically exhibit among the hottest of summer temperatures. In the Southern Hemisphere, the same period typically occurs in February and March, in the midst of the austral summer.
==General description==
As Paul Harris and Tom Jorgensen of the American weather and farming annual, ''The Old Farmer's Almanac,'' explain, "()he phrase 'Dog Days' conjures up the hottest, most sultry days of summer," coinciding with the rising, at sunrise (i.e., the heliacal rising), of Sirius, the dog star, in the constellation Canis Major.〔Jay B. Holberg, 2007, ''Sirius: Brightest Diamond in the Night Sky'' (Praxis Books ), Berlin, DEU: Springer Science & Business, ISBN 0387489428, see (), accessed 29 July 2015.〕 While the correlation between the hottest and most humid weather of the year with this specific calendar period has not survived the broadening of weather understanding and communications to global, the correlation of the rising of Sirius with extreme heat has been sufficient in enough climes in the Northern Hemisphere such that the expression dog days "with hot, sultry weather was made for all time."〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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