Saturday, March 7, 2009

Cancer


Cancer is one of the twelve constellations of the zodiac. Its name is Latin for crab and it is commonly represented as such. Its symbol is (Unicode ♋). Cancer is small and its stars are faint. It lies between Gemini to the west and Leo to the east, Lynx to the north and Canis Minor and Hydra to the south.

Planetary system

Cancri is a quintruple planet system with four gas giants and one terrestrial planet.

Deep sky objects

Cancer is the best noted among stargazers as the home of Praesepe (Messier 44), an open cluster also called the Beehive Cluster or the Gate of Men, which contains the star ε Cancri. The smaller, denser open cluster Messier 67 can also be found here.

Mythology

Cancer the crab, plays a minor role in the Twelve Labors of Hercules. While Hercules was busy fighting the multi-headed monster, Hydra, the goddess Hera, who did not like Hercules, sent the Crab to distract him. Cancer grabbed onto the hero's toe with its claws, but barely breaking the rhythm of his great battle with Hydra, Hercules crushed the crab with his foot. Hera, grateful for the little crustacean's heroic but pitiful effort, gave it a place in the sky.

Cancer is said to have been the place for the Akkadian Sun of the South, perhaps from its position at the winter solstice in very remote antiquity. But afterwards it was associated with the fourth month Duzu (June-July in the modern western calendar), and was known as the Northern Gate of Sun.[citation needed]

Showing but few stars, and its brightest stars being of only 4th magnitude, Cancer was often considered the "Dark Sign", quaintly described as black and without eyes. Dante, alluding to this faintness and position of heavens, wrote in Paradiso:

Then a light among them brightened,
So that, if Cancer one such crystal had,
Winter would have a month of one sole day.

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