Question

why is the difference between the duration of the day or night hardly felt at kanayakumari

Answer 1

Kanyakumari is close to the equator, whereas Kashmir is far from the equator. This means that Kanyakumari is at a lesser latitude as compared to Kashmir. We know that Kanyakumari is at 8°N latitude, it is just 8 degrees from the equator. As equator receives direct sunlight, the duration between day and night would hardly be felt at Kanyakumari. On the other hand, Kashmir is at 37°N latitude, which means that it is 37 degrees away from the equator or it is 37 degrees away from the area which receives direct sunlight. So, there would be a big difference in the duration of day and night in Kashmir. This difference is of about 5hrs in Kashmir.

Answer 2

 difference between the duration of the day or night hardly felt at Kanyakumari because the sea exerts a moderating influence on climate; as the distance from the sea increases, its moderating influence decreases.
it is also because it is very close to the equator so it receives direct sunlight on it all the time.