On 21st June, the Sun
Contents15
- Adoes not set below the horizon at the Arctic Circle
- Bdoes not set below the horizon at Antarctic Circle
- Cshines vertically overhead at noon on the Equator
- Dshines vertically overhead at the Tropic of Capricorn
Show answer
Answer: (A) does not set below the horizon at the Arctic Circle
The correct answer is (A) — the Sun does not set below the horizon at the Arctic Circle.
June 21st is the Summer Solstice — the longest day in the Northern Hemisphere.
On this day, the Sun is directly overhead at the Tropic of Cancer (not the Equator or Capricorn).
The North Pole is tilted maximally toward the Sun, so places at or above the Arctic Circle experience 24 hours of daylight (midnight sun).
Meanwhile, the Antarctic Circle has 24 hours of darkness.
Tip:
- June 21 = Summer Solstice
- Sun overhead at Tropic of Cancer
- Arctic = 24-hour daylight
- Antarctic = 24-hour darkness
On June 21st (Summer Solstice), the Sun is directly overhead at the Tropic of Cancer, creating 24-hour daylight at the Arctic Circle and 24-hour darkness at the Antarctic Circle.
UPSC tests solstice concepts to check if students understand Earth's axial tilt and how it creates seasonal variations in daylight across different latitudes.
Summer Solstice
Geography 21st June Sun Arctic Circle
Summer Solstice: June 21st & UPSC Key Facts
June 21st is the Summer Solstice — longest day in Northern Hemisphere
Sun is directly overhead at Tropic of Cancer (23.5°N)
Arctic Circle experiences 24-hour daylight (midnight sun)
Antarctic Circle has 24-hour darkness
What Happens
The Summer Solstice occurs when the North Pole is tilted maximally toward the Sun at 23.5°. This creates the longest day in the Northern Hemisphere and shortest day in the Southern Hemisphere.
Global Effects on June 21st
Location | Sun Position | Daylight Pattern | Season |
|---|---|---|---|
Tropic of Cancer (23.5°N) | Directly overhead at noon | Longest day | Summer begins |
Arctic Circle (66.5°N) | Never sets | 24-hour daylight | Midnight sun |
Equator (0°) | Not overhead | 12 hours daylight | No seasonal change |
Tropic of Capricorn (23.5°S) | Farthest from overhead | Shortest day | Winter begins |
Antarctic Circle (66.5°S) | Never rises | 24-hour darkness | Polar night |
Question Analysis
This PYQ tests whether you know the correct latitude where the Sun is overhead (Tropic of Cancer, not Equator or Capricorn) and which polar region gets 24-hour daylight (Arctic Circle during Northern summer).
Trap: Confusing Tropic of Cancer with Equator — Sun is never overhead at Equator on June 21st
Trap: Mixing up Arctic vs Antarctic — in June, Arctic gets daylight, Antarctic gets darkness
Trap: Thinking Sun is overhead at Tropic of Capricorn — that happens on December 21st (Winter Solstice)
Winter Solstice
Geography
Winter Solstice: December 21st & Comparison with Summer
December 21st is the Winter Solstice — shortest day in Northern Hemisphere
Sun is directly overhead at Tropic of Capricorn (23.5°S)
Antarctic Circle gets 24-hour daylight, Arctic Circle gets darkness
Mechanism
On December 21st, the South Pole is tilted maximally toward the Sun. This creates the shortest day in the Northern Hemisphere and longest day in the Southern Hemisphere — exactly opposite to June 21st.
June vs December Solstice
Aspect | June 21st (Summer) | December 21st (Winter) |
|---|---|---|
Sun overhead at | Tropic of Cancer (23.5°N) | Tropic of Capricorn (23.5°S) |
Northern Hemisphere | Longest day (summer) | Shortest day (winter) |
Southern Hemisphere | Shortest day (winter) | Longest day (summer) |
Arctic Circle | 24-hour daylight | 24-hour darkness |
Antarctic Circle | 24-hour darkness | 24-hour daylight |
Tilt direction | North Pole toward Sun | South Pole toward Sun |
Memory trick: June = Cancer (both start with consonants), December = Capricorn (both start with C)
Trap: Forgetting that seasons are opposite in Northern vs Southern Hemispheres
Trap: Arctic and Antarctic patterns are always opposite — when one has daylight, other has darkness
Earth's Axial Tilt
Geography
Earth's 23.5° Tilt: Why Solstices Happen
Earth's axis is tilted 23.5° from perpendicular to orbital plane
Tilt direction stays constant as Earth revolves around Sun
Creates seasonal variations in daylight and temperature
Core Mechanism
Earth's 23.5° axial tilt is the root cause of seasons. As Earth revolves around the Sun, this tilt means different parts of Earth receive direct vs oblique solar radiation at different times of year.
How Tilt Creates Solstices
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Earth's axis tilted 23.5°**
Permanent tilt relative to orbital plane`"]
s2["`**Tilt direction stays fixed**
Points toward same stars as Earth revolves`"]
s3["`**June: North Pole toward Sun**
Northern Hemisphere gets direct radiation`"]
s4["`**December: South Pole toward Sun**
Southern Hemisphere gets direct radiation`"]
s5["`**Extreme daylight patterns**
24-hour day/night at polar circles`"]
s1 --> s2
s2 --> s3
s3 --> s4
s4 --> s5Tilt Visualization
Source: National Weather Service — The Seasons, the Equinox, and the Solstices · www.weather.gov
Key Numbers
Arctic Circle: 66.5°N (90° - 23.5°)
Antarctic Circle: 66.5°S (90° - 23.5°)
Tropic of Cancer: 23.5°N (matches Earth's tilt)
Tropic of Capricorn: 23.5°S (matches Earth's tilt)
Equinoxes
Geography
Equinoxes: March 21st & September 23rd
March 21st and September 23rd are equinoxes — equal day/night globally
Sun is directly overhead at Equator on both dates
12 hours daylight and 12 hours darkness everywhere on Earth
What Happens
During equinoxes, Earth's axis is tilted neither toward nor away from the Sun. The terminator line (day-night boundary) passes through both poles, creating equal daylight everywhere.
Solstices vs Equinoxes
Aspect | Solstices (Jun/Dec) | Equinoxes (Mar/Sep) |
|---|---|---|
Sun overhead at | Tropic of Cancer/Capricorn | Equator |
Day length variation | Maximum difference globally | Equal everywhere (12 hours) |
Polar regions | 24-hour day OR night | Normal day-night cycle |
Seasonal significance | Peak summer/winter | Transition between seasons |
Hemisphere differences | Opposite seasons | Same transition globally |
Trap: Sun is overhead at Equator during equinoxes, NOT during solstices
Memory aid: Equinox = Equal day and night
Trap: March equinox is spring in Northern Hemisphere but autumn in Southern Hemisphere