The Earth : Our Habitat — Social Science STD 6 — Question
Gujarat BoardEnglish MediumSTD 6Social ScienceThe Earth : Our Habitat3 Marks
Question
Write short note : Equinox
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Answer
The sun’s apparent orbit and the equator intersect each other twice in a year. The day on which they intersect each other, is known as Equinox. During Equinox, the sun shifts northwards in the northern hemisphere, so the length of the day increases in the northern hemisphere after $22nd$ March and nights become shorter. June $21st$ is the longest day and shortest night of the year in the northern hemisphere. With the sun shifting southwards, the day becomes longer and the night shorter in southern hemisphere. December $22$ is the longest day and shortest night of the year in southern hemisphere. During the year, the sunrays fall vertically (directly) over the equator on $21st$ March and $23rd$ September. Hence, day and night are equal on these days, which are called ‘Vishuvdin’ (equinox).
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