In religious or mythological cosmology, the seven heavens refer to seven levels or divisions of the Heavens. The concept, also found in the ancient Mesopotamian religions, can be found in Judaism, Christianity, and Islam; a similar concept is also found in some other religions such as Hinduism. Some of these traditions, including Jainism, also have a concept of seven earths or seven underworlds both with the metaphysical realms of deities and with observed celestial bodies such as the classical planets and fixed stars.
Each of the seven heavens corresponds to one of the seven classical planets known in antiquity. Ancient observers noticed that these heavenly objects (the Moon, Mercury, Venus, the Sun, Mars, Jupiter, and Saturn) moved at different paces in the sky both from each other and from the fixed stars beyond them. Unlike comets, which appeared in the sky with no warning, they did move in regular patterns that could be predicted. They also observed that objects in the sky influenced objects on earth as when movements of the sun affect the behavior of plants or movements of the moon affect ocean tides. Others believe the seven heavens are related to the seven stars of Orion, the Big Dipper, Little Dipper and the Pleaides/Seven Sisters according to ancient western astrology.
The concept of seven heavens as developed in ancient Mesopotamia symbolised both physical and metaphysical concepts. In the Sumerian language, the words for heavens (or sky) and earth are An and Ki. The ancient Mesopotamians regarded the sky as a series of domes (usually three, but sometimes seven) covering the flat earth. Each dome was made of a different kind of precious stone. The lowest dome of the heavens was made of jasper and was the home of the stars. The middle dome of heaven was made of saggilmut stone and was the abode of the Igigi. The highest and outermost dome of the heavens was made of luludānītu stone and was personified as An, the god of the sky. The celestial bodies were equated with specific deities as well.