Astronomical Dictionary


Dictionary of Astronomical Definitions and Terms.
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

 

Definition


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Hubble
Edwin Powell Hubble (1889-1953) American astronomer known for seminal work in modern cosmology.
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Hummocky
Uneven; describing a terrain abounding in irregular knolls, mounds, or other small elevations.
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Hyperion
In Greek mythology, a Titan, son of Uranus and Gaea. Husband of Theia and father of Eos (the Dawn). A handsome wanderer, his name is said to signify height or superiority.
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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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Jovian
Of or relating to the planet Jupiter.
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Jupiter
Planet fifth in order from the sun. In Roman mythology, ruler of the gods. (Greek name, Zeus).
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Kuiper
Gerard Peter Kuiper (1905-1973) American astronomer born in The Netherlands. Studied the origin of the solar system, and planetary atmospheres.
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Light Year
The distance that light can travel in one year. Tnisis equal to about 5.84 trillion miles (9.47 Trillion Km).
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Limb
The outer edge of the disc of a celestial body. The leading limb of an object is termed the preceding limb, and the trailing limb is termed the following limb.
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Luminosity
Absolute brightness. The rate at which a star emits radiant energy. It is expressed as a multiple of the Sun's output.
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Lunation
The period between successive New Moons. The term also refers to the synodic month or period between two New Moons.
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Lakshmi
In Indian mythology, the goddess of all forms of wealth. The reverence for cows in Hindu India is based on worship of this goddess, as in that tradition cows are a representation of wealth.
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Leverrier
Urbain Jean Joseph Le Verrier (1811-1877) French astronomer who performed the calculations that predicted the existence of the planet Neptune.
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Lineament
A linear topographic feature, such as a fault line, aligned volcanoes, or straight stream course.
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Loki
In Scandinavian mythology, a mischievous trickster, thief and slanderer.
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Magnetosphere
The region of space in which a planet's magnetic field dominates that of the solar wind.
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Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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