Discussion
Imagine if the earth is not inclined towards the plane of its orbit, then
A. the circle of illumination will match with longitudinal lines.
B. the circle of illumination will match with latitudinal lines.
C. there will be no seasonal variation in a particular region.
D. there will be more seasonal variation in a particular region.
Choose the correct option.
Answer: A
The correct statements are A and C, so the answer is A and C.
The circle of illumination divides day from night. Because the Earth's axis is tilted, this circle does not pass through the poles, which is why days and nights differ in length and seasons change. If the axis were not inclined, the circle of illumination would pass through both poles and so would match the longitudinal lines (A). Every place would get twelve hours of day and night all year and the Sun's rays would strike each latitude at the same angle all year, so there would be no seasonal variation (C).
B is wrong because latitudes run east-west and cannot divide day from night, and D is the opposite of what would happen.
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