When does the sun shine vertically on the Equator?

A. Throughout the year
B. For six months
C. Twice a year
D. Once a year
Answer» C. Twice a year
Explanation: When the Sun is vertically above the equator, the day is of equal length all over Earth. This happens twice a year, and these are the "equinoxes" in March and in September. Between the two tropic zones, which includes the equator, the Sun is directly over-head twice per year. Outside the tropic zones, whether to the south or north, the Sun is never directly overhead.
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