Astronomical Dictionary
Letter: L


Dictionary of Astronomical Definitions and Terms.
Astronomical | L

 

Definition


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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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