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summer solstice

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noun Astronomy.
  1. the solstice on or about June 21st that marks the beginning of summer in the Northern Hemisphere.
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Origin of summer solstice

First recorded in 1540–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for summer solstice

summer solstice

noun
  1. the time at which the sun is at its northernmost point in the sky (southernmost point in the S hemisphere), appearing at noon at its highest altitude above the horizon. It occurs about June 21 (December 22 in the S hemisphere)
  2. astronomy the point on the celestial sphere, opposite the winter solstice, at which the ecliptic is furthest north from the celestial equator. Right ascension: 6 hours; declination: 23.5°
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

summer solstice in Science

summer solstice

[sŭmər]
  1. See under solstice.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.