Kanyakumari is situated near Equator here day and night are almost equal but as we advance towards north or south of the equator the sun rays become oblique (slanting) making the difference between the length of the day and night progressively more and more. at the nethermost tip of India this difference is about 5 Hours.
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It's because of the longitudes and affects the duration of day and night . as the earth moves west to east the jammu comes first in the front of sun
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