Astronomical Dictionary
Letter: I


Dictionary of Astronomical Definitions and Terms.
Astronomical | I

 

Definition


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Inclination
1 The smaller of the dihedral angles formed by the intersection of the orbital plane of one body with some reference plane (usually the Ecliptic or Celestial Equator).
2 The angle between the normals to these planes. For Binary or Multiple Stars, the reference plane is usually taken as the line of sight.
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Inferior Conjunction
Conjunction of an inner planet with the Sun, when the planet is between the Earth and the Sun. In other words, when Mercury, or Venus, are directly between the Sun and Earth.
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Inferior Planets
The minor planets, those whose orbits are within that of the Earth: viz.: Mercury and Venus. v. Planets. They are called inferior planets because their orbits lie between that of the Earth and the Sun.
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Iapetus
In Greek mythology, a son of Uranus and Gaea. Father of Atlas, Epimetheus, Menoetius, and Prometheus.
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Ida
In Greek mythology, the mountain on Crete where Zeus spent his childhood.
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Igneous rock
Rock solidified from a molten state.
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Imbrium
Mare Imbrium - Latin for "Sea of Rains".
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Io
In Greek mythology, a young woman seduced by Zeus, who then transformed her into a heifer to protect her from his jealous wife.
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Ishtar
In Babylonian mythology, goddess of love and war. Ruler of the Moon, as well as the morning and evening stars (alternate names for the planet Venus).
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Ithaca
A Greek island, home of Odysseus.
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