The Zodiac symbols known to have been in use by the Roman era based on concepts inherited by Hellenistic astronomy from Babylonian astronomy of the Chaldean period (mid-1st millennium BC), which, in turn, derived from an earlier system of lists of stars along the ecliptic. The construction of the zodiac is described in Ptolemy's Almagest (2nd century AD). The division of the ecliptic into the zodiacal signs originates in Babylonian ("Chaldean") astronomy during the first half of the 1st millennium BC, likely during Median/"Neo-Babylonian" times (7th century BC). The classical zodiac is a modification of the MUL.APIN catalogue, which was compiled around 1000 BC. Some of the constellations can be traced even further back, to Bronze Age (Old Babylonian) sources. Cancer (♋) is the forth astrological sign in the Zodiac, which is associated with the constellation Cancer. It spans the 90-120th degree of the zodiac, between 90 and 125.25 degree of celestial longitude. Under the tropical zodiac, the Sun transits this area on average between June 22 to July 21, and under the sidereal zodiac, the Sun transits this area between approximately July 16 and August 15.
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