Discovered in the library of King Ashurbanipal (ruler of
Assyria between 669-626 BC) the “Mul.Apin” series of clay tablets dated 687 BC helped the scholars to further improve our knowledge of the Babylonian Astronomy. Mul.Apin can be defined an astronomical compendium including a list of 66 stars and constellations and indications about astronomical phenomena such as rising, setting and culmination dates. The main vision of the sky adopted in the Mul.Apin follows the tradition of the Circular Star Calendars using the tripartite division of the Paths of Ea, Anu and Enlil since Mul-Apin is known to be a reproduction of an earlier text presumably written around 1000 BC which contains the full description of the Mesopotamian constellation dating to the late 2nd millennium BC.
The text runs to two tablets divided in sections: section number 2 of tablet number 1 contains a sequential list of the heliacal rising dates of 36 stars in a calendar comprised of 12 months of 30 days each. In the Mul.Apin tablets the Zodiac is not yet divided into twelve equal parts: the path of the Moon is described as crossing Seventeen /Eighteen constellation along the Ecliptic.
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