Question

Read the Paragraph under the title ‘Equinox’ and comment on it. 

   '' On 21st March and September 23rd direct rays of the Sun fall on the equator. At this position, neither of the poles is tilted towards the Sun. So, the whole earth experiences equal days and nights. This is called an equinox. On 23rd September, it is autumn season in the Northern Hemisphere and spring season in the Southern Hemisphere. The opposite is the case on 21st March when it is spring in the Northern Hemisphere and autumn in the Southern Hemisphere. Thus, you find days and nights and changes in the seasons because of the rotation and revolution of the earth.''

Answer 1

On 21st March and 23rd, September Sun’s rays fall directly on the Equator. So we experience equal day and night on both these days. This is called equinox. On 21st March it is autumn in the Northern Hemisphere and spring in the Southern Hemisphere. Because of Earth’s rotation, half portion of the Earth receives Sun’s rays and the remaining half remains in darkness. So we find changes on Earth because of Earth’s rotation and revolution.