The sunlight is available 24 hours on the longest day at which of the following latitudes of the earth?
a) 49 degrees
b) 66.5 degrees
c) 63 degrees
d) 69.5 degrees
Answer. b) 66.5 degrees
The sunlight is available 24 hours on the longest day at 66.5 degrees North/South latitudes of the earth.
Why sunlight is available 24 hours at 66.5 degrees latitudes of the Earth?
The imaginary line that separates light from darkness and day is known as the circle of illumination. Earth is tilted 23.5 degrees from the circle of illumination. If the earth would not be tilted, 90 degrees North/South latitude would have 24 hours of sunlight. Due to this tilt, The sunlight is available 24 hours on the longest day at 66.5 degrees (90-23.5=66.5 degrees) in North/South latitudes ( Arctic and Antarctic Circle).
Other Key points:
Norway is known as the land of the midnight Sun.
21st June is also known as the summer solstice as this day midday sun overhead at 23.5 degrees North latitude ( tropic of cancer).
Tropic of Cancer ( 23.5 degrees North latitude) passes about the middle of India and it passes through eight states namely Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram.
Mahi River ( Madhya Pradesh) crosses twice of tropic of cancer.
Nile River crosses twice the equator ( zero degrees latitudes).
The Limpopo River in South Africa crosses the Tropic of Capricorn twice.
Africa is the only continent where the Tropic of Cancer ( 23.5 degrees North), Equator, and Tropic of Capricorn ( 23.5 degrees South) pass.
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