Global Geological And Climatic Events

Summer Solstice 2022: What is it and how is it significant?

Note4Students

From UPSC perspective, the following things are important :

Prelims level: Summer Solstice

Mains level: NA

Yesterday, June 21 was the day of the summer solstice in the northern hemisphere.

What is Summer Solstice?

  • Solstice means “sun stands still” in Latin.
  • The longest day of 2021 for those living north of the Equator is June 21.
  • This day is characterized by a greater amount of energy received from the sun.
  • In technical terms, this day is referred to as the summer solstice, the longest day of the summer season.
  • It occurs when the sun is directly over the Tropic of Cancer, or more specifically right over 23.5-degree north latitude.

The Southern Hemisphere receives most sunlight on December 21, 22 or 23 when the northern hemisphere has its longest nights– or the winter solstice.

Why do we have summer solstice?

  • Since Earth rotates on its axis, the Northern Hemisphere gets more direct sunlight between March and September over the course of a day.
  • This also means people living in the Northern Hemisphere experience summer during this time.
  • The rest of the year, the Southern Hemisphere gets more sunlight.
  • During the solstice, the Earth’s axis — around which the planet spins, completing one turn each day — is tilted in a way that the North Pole is tipped towards the sun and the South Pole is away from it.

Answer this PYQ in the comment box:

Q.On 21st June, the Sun (CSP 2019):

 

(a) Does not set below the horizon at the Arctic Circle

(b) Does not set below the horizon at Antarctic Circle

(c) Shines vertically overhead at noon on the Equator

(d) Shines vertically overhead at the Tropic of Capricorn

 

Post your answers here.
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Some interesting facts

  • During the June solstice compared to any other time of the year, the North Pole is tipped more directly toward the sun, and the south pole is tipped more directly away from the sun.
  • As a result, all locations north of the equator see days longer than 12 hours and all locations south see days shorter than 12 hours.
  • The sun’s path across the sky is curved—NOT a straight line on the summer solstice.
  • Based on Earth’s current orbit, the summer solstice date rotates between June 20, 21 and 22 and is not fixed since it depends on the physics of our solar system and not on human calendar.

 

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a) Does not set below the horizon at the Arctic Circle

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