<P> The dog days or dog days of summer are the hot, sultry days of summer . They were historically the period following the heliacal rising of the star Sirius, which Greek and Roman astrology connected with heat, drought, sudden thunderstorms, lethargy, fever, mad dogs, and bad luck . They are now taken to be the hottest, most uncomfortable part of summer in the Northern Hemisphere . </P> <P> The English name is a calque of the Latin dies caniculares (lit . "the puppy days"), itself a calque of the Greek kynádes hēmérai (κυνάδες ἡμέραι, "dog days"). The Greeks knew the star α Canis Majoris by several names, including Sirius (Σείριος, Seírios, "Scorcher"), Sothis (Σῶθις, Sôthis, a transcription of Egyptian Spdt), and the Dog Star (Κῠ́ων, Kúōn). The last name reflects the way Sirius follows the constellation Orion into the night sky . </P>

When do dog days start in the us
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