Astronomy terms are used to describe the various phenomena in space. In this section you can learn what every astronomy term means and how it helps us to better understand the cosmos.


Month, a unit of time. The calendar month is approximately 1/12 of the calendar year.

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  • Meteor


    Meteor. As the term is commonly used, a meteor is a small celestial body that enters the atmosphere of the earth. See more »

  • Meteorite


    Meteorite, a meteor that reaches the earth's surface. Meteors are naturally occurring objects that enter the earth's atmosphere from space, traveling at high speed. See more »

  • Pulsar


    Pulsar, a celestial body that emits radio signals in short, very evenly spaced bursts, or pulses. See more »

  • Satellite, Artificial

    Satellite, Artificial

    Satellite, Artificial, a man-made object that orbits the earth, the moon, the sun, or any other celestial body. See more »

  • Seasons


    Seasons, the four divisions of the year, called spring, summer, autumn (or fall), and winter. See more »

  • Sundial


    Sundial, a device used to tell time by the sun. Nearly every sundial has two basic parts: a pointer, called a style or gnomon, which casts a shadow; and a numbered dial on which the shadow falls to show the hour. See more »

  • What is a light year?

    What is a light year?

    A light year is a way of measuring distance. That doesn't make much sense because "light year" contains the word "year," which is normally a unit of time. Even so, light years measure distance. See more »

  • Year


    Year, a unit of time. It is based on the time it takes the earth to make one revolution around the sun. See more »

  • Aberration of Light

    Aberration of Light

    Aberration of Light, a phenomenon in which a star or other celestial body, as viewed from the earth, appears to be slightly displaced from its true position. See more »

  • Albedo


    Albedo, in astronomy, the reflecting power of a celestial body that is not self-luminous. See more »

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