summer solstice

sum′mer sol′stice, [Astron.]

Astronomythe solstice on or about June 21st that marks the beginning of summer in the Northern Hemisphere.

Collins Concise English Dictionary © HarperCollins Publishers::

summer solstice n

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)
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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