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As the planet Venus

Inanna was associated with the planet Venus, which is named after her Roman equivalent. Several hymns praise Inanna in her role as the goddess or personification of the planet Venus. Theology professor Jeffrey Cooley has argued that, in many myths, Inanna's movements may correspond with the movements of Venus across the sky. In Inanna's Descent to the Underworld, Inanna, unlike any other deity, is able to descend into the netherworld and return to the heavens. The planet Venus appears to make a similar descent, setting in the West and then rising again in the East. An introductory hymn describes Inanna leaving the heavens and heading for Kur, what could be presumed to be the mountains, replicating the rising and setting of Inanna to the West. In Inanna and Shukaletuda, Shukaletuda is described as scanning the heavens in search of Inanna, possibly searching the Eastern and Western horizons. In the same myth, while searching for her attacker, Inanna herself makes several movements that correspond with the movements of Venus in the sky.

Because the movements of Venus appear to be discontinuous (it disappears due to its proximity to the Sun, for many days at a time, and then reappears on the other horizon), some cultures did not recognize Venus as a single entity; instead, they assumed it to be two separate stars on each horizon: the morning and evening star. Nonetheless, a cylinder seal from the Jemdet Nasr period indicates that the ancient Sumerians knew that the morning and evening stars were the same celestial object. The discontinuous movements of Venus relate to both mythology as well as Inanna's dual nature.

Modern astrologers recognize the story of Inanna's descent into the underworld as a reference to an astronomical phenomenon associated with retrograde Venus. Seven days before retrograde Venus makes its inferior conjunction with the sun, it disappears from the evening sky. The seven day period between this disappearance and the conjunction itself is seen as the astronomical phenomenon on which the myth of descent was based. After the conjunction, seven more days elapse before Venus appears as the morning star, corresponding to the ascent from the underworld.

Inanna in her aspect as Anunītu was associated with the eastern fish of the last of the zodiacal constellations, Pisces. Her consort Dumuzi was associated with the contiguous first constellation, Aries.