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Definition of "sidereal" [si•de•re•al]

  • Of, relating to, or concerned with the stars or constellations; stellar. (adjective)
  • Measured or determined by means of the apparent daily motion of the stars: sidereal time. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "sidereal" in a sentence
  • "This is the difference between what we call the sidereal day (the time that it takes to make one complete rotation) and the synodic day (the time that it takes to go from the Sun highest in the sky until the Sun is again at its highest in the sky)."
  • "Kepler, Galileo, and Newton in the seventeenth century, were the means of effecting a rapid advance in the science of astronomy; but that branch of it known as sidereal astronomy was not then in existence."
  • "It's called sidereal or Vedic astrology, and it's popular in India."
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