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.


Eclipse. An eclipse of the sun, or solar eclipse, occurs when the moon's shadow sweeps across the earth.

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  • Albedo


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

  • Andromeda Galaxy

    Andromeda Galaxy

    Andromeda Galaxy, a spiral galaxy that is larger than the Milky Way (the galaxy to which Earth belongs) but similar to it in structure, and the closest to ours. See more »

  • Astrogeology


    Astrogeology, the science that applies the principles of geology to the study of solid bodies of the solar system other than the earth. See more »

  • Astrophysics


    Astrophysics, the application of the theories and techniques of modern physics to astronomy. See more »

  • Autumn


    Autumn, or Fall, the season of the year that follows summer and comes before winter. See more »

  • Azimuth


    Azimuth, the horizontal direction of an object, measured clockwise in degrees, minutes, and seconds of arc from true north or south along the theoretical horizon. See more »

  • Bolometer


    Bolometer, an instrument used to measure infrared, or heat, radiation. The bolometer is essentially a very sensitive thermometer. See more »

  • Brown Dwarf

    Brown Dwarf

    Brown Dwarf, a celestial object more massive than a planet but less massive than a star. See more »

  • Calendar


    Calendar, a system of dividing time into convenient periods of days, months, and years. See more »

  • Chronology


    Chronology, the science of measuring time. Chronology divides time into regular divisions or periods, and assigns events their proper place and sequence by giving them dates. See more »

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