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प्रश्न
Why are days and nights equal throughout the world on 21st March and 23rd September?
उत्तर
21 st March and 23rd September are seasonal positions of the Earth and are known as equinoxes meaning equal nights. The Sun is overhead at the equator. Both the Hemispheres are equally inclined towards the Sun. The circle of light passes through the poles. With the result, one half of each hemisphere is in the light and the other half in darkness. So the days and nights are equal all over the world.
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संबंधित प्रश्न
What are the lines of latitude and longitude?
Name the thermal zones of the earth.
What is the globe? State the importance of a globe.
Give a reason for the following:
A globe is the most popular model of the earth.
Give reasons for the following
The speed of the rotation of the earth is greater at the Equator than at the Arctic Circle.
Give reasons for the following
Days and nights are equal at all places on earth on March 21.
Which is the longest and which is the shortest day in the Northern Hemisphere and why?
Give reasons for the following :
Altitude of the Sun varies at a place according to seasons
Give reasons for the following :
Seasons are reversed between Northern and Southern Hemisphere.
What is a Geoid?
