If summer starts June 21 how can Mid-Summer day be June 24 ?

Answers (2)

Midsummer is the period of time centered upon the summer solstice, and more specifically the northern European celebrations that accompany the actual solstice or take place on a day between June 19 and June 25 and the preceding evening.

The summer solstice (or estival solstice), also known as midsummer, occurs when a planet's rotational axis, or geographical pole on either its northern or its Southern Hemisphere, is most inclined toward the star that it orbits.

It does not mean middle of summer. :-)

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"First day of summer" means Summer solstice.
2018 in Northern Hemisphere will be at 3:07 AM on
Thursday, June 21

Mid·sum·mer Day
noun
(in England, Wales, and Ireland) June 24, originally coinciding with the summer solstice and in some countries marked by a summer festival.

Solstice | Define Solstice at Dictionary.com
www.dictionary.com/browse/solstice
Astronomy. either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when it reaches its southernmost point. Compare summer solstice, winter solstice.

All results from google.com

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