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| Q. |
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 | |
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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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