Explanation

March Equinox (Northern Hemisphere)

• - Also called the Vernal or Spring Equinox.
• - Occurs around 20 March (sometimes 19 or 21 March).
• - Marks the beginning of spring.

September Equinox (Northern Hemisphere)

• - Also called the Autumnal or Fall Equinox.
• - Occurs around 22 or 23 September.
• - Marks the beginning of autumn.

 Last updated on 12 NOV 2026

Explanation

• Summer Solstice in the Southern Hemisphere
• - Date: 21 or 22 December.
• - Significance: Longest day and shortest night of the year.
• - Cause: The Southern Hemisphere is tilted towards the Sun.
• - Sun's position: Directly overhead at the Tropic of Capricorn (23.5° South).

Additional Information:

The summer solstice in the Northern Hemisphere occurs during June (20 or 21 June)

Last updated 08 Nov 2026 by NA

Explanation

• The Gregorian calendar is the most widely used civil calendar worldwide today.
• It was introduced by Pope Gregory XIII in 1582.

Additional information:

• Julian Calendar: Introduced by Julius Caesar in 45 BC.

Last verified on 14-10-2026

Explanation

• Date: April 22
• First Held: April 22, 1970
• Purpose: Raise awareness for environmental protection and conservation
• Theme 2026: Our Power, Our Planet 

Explanation

• World Health Day is observed on 7th April every year.
• Theme 2025: Healthier beginnings, hopeful futures
• Theme 2026: Together for health. Stand with science

Additional information: 

• World Health Organization (WHO) was founded on 7 April 1948.
• WHO has its headquarters in Geneva, Switzerland.

Last verified on 12-10-2026