Explanation

If Earth had no atmosphere, the sky would appear black even during the day,

Hence, the sky would appear black, just like it does from space.

Explanation

"Equinox"  means Equal duration of day and night.

The time or date (twice each year) at which the sun crosses the celestial equator 

During the equinoxes, solar declination is 0°

The September equinox is called the autumnal or fall equinox on 23 September

The March equinox is called the vernal or spring equinox on 19 March or as late as 21 March

Explanation

Explanation

Days and nights are always of nearly equal length at the Equator,

The imaginary line circling the Earth at 0° latitude

This event is known as the equinox.

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Explanation

Explanation

World Braille Day is an international day on 4 January 

The first World Braille Day was celebrated on January 4, 2019

The day recognizes the contributions of Louis Braille in helping blind and visually impaired people to read and write.

Explanation

 Global Day of Parents is observed on first June every year.

Theme 2022: Appreciate all parents throughout the world

Explanation

International Tea Day is celebrated on 21 May annually 

First time celebrated in 2020 by the United Nations.  

Theme 2025: Tea for Better Lives

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Explanation

February has 28 days in a common year and 29 days in a leap year.

All other months have 30 or 31 days.

Explanation