Pisces is a constellation of the zodiac. Its name is the Latin plural for fish. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations defined by the International Astronomical Union. It lies between Aquarius to the west and Aries to the east. The ecliptic and the celestial equator intersect within this constellation and in Virgo. Pisces is the twelfth astrological sign in the Zodiac, originating from the Pisces constellation. The Sun transits this area on average between February 19 to March 20 each year. Poeticon astronomicon is a star atlas whose authorship is disputed. The work was originally attributed to the Roman historian Gaius Julius Hyginus (64 BC - AD 17). The Poeticon astronomicon was not formally published until 1482, by Erhard Ratdolt. He commissioned a series of woodcuts, but the relative positions of the stars bear little resemblance to the descriptions given by Hyginus in the text or the actual positions of the stars in the sky.