Where does the vertical ray fall on the Equinox:

Earth's axis always points in the same direction. Because of this, the part of Earth that receives the most direct rays from the Sun changes as the Earth travels around the Sun. At the equinox, the Sun's rays shine most directly on the equator, and the Northern and Southern Hemispheres get the same amount of Sunlight.

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From September to December 21, the Sun's perpendicular rays migrate from the equator to 23.5o S latitude (Tropic of Capricorn). d. From December to March 21, the Sun's perpendicular rays migrate from 23.5o S latitude to the equator.    

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Explanation:

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