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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 is meant by Equinox ? Give the dates of the two Equinoxes.
Give reasons for the following
The period of twilight and dawn increases polewards.
Give reasons for the following
Vertical rays are hotter than slanting rays.
Describe the two interesting phenomena made by the circle of illumination viz., Solstice and Equinox.
Distinguish between :
Twilight and Dawn.
When does the winter solstice occur?
Give reasons for the following Statement :
The areas, lying on the Equator, have their duration of day-light almost constant throughout the year.
Give reasons for the following statement:
Beyond the tropics, the Sun is never overhead
Give reasons for the following :
Altitude of the Sun varies at a place according to seasons
Give reasons for the following:
The variation in the lengths of day and night goes on increasing polewards.
