<Table> <Tr> <Td> </Td> <Td> This article's use of external links may not follow Wikipedia's policies or guidelines . Please improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references . (November 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article's use of external links may not follow Wikipedia's policies or guidelines . Please improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references . (November 2017) (Learn how and when to remove this template message) </Td> </Tr> <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 system 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>

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