INSIGHT UPSC QUIZ

ANS. (C) 
As the Earth moves around its orbit, it reaches two points during the year where the tilt of its axis causes it to be straight relative to the Sun. These days are known as equinoxes. During these equinoxes the rays of the Sun shine directly on the equator. This happens on approximately 21st March and 23rd September.
At two points throughout the year, the tilt of the Earth’s axis reaches its maximum angle compared to the Sun. This usually happens around June 21st and December 21st. These days are known as solstices when the rays of the Sun shine directly on one of the two Tropics. In other words, on the day of summer solstice, the sun shines directly above the Tropic of Cancer and on winter solstice, it is directly above the Tropic of Capricorn.