Cancer (Crab) is fourth sign, and first of Summer Signs, of Zodiac. The sun enters Cancer on 21st June, giving the Northern Hemisphere their longest day and the Southern their shortest. The Sun, reaching its greatest height in the North, moves backward along ecliptic, which accounts for the Crab being used as symbol for this sign. Cancer contains several 'double' stars and a 'triple' star. Over 90 stars can be seen with the naked eye. One cluster of over 150 stars of sixth and lower magnitudes was known to ancients as Praesepe or Beehive.
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