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| A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun? |
| A) There are variations in the Earth's rotational speed. |
| B) Measurement of time is along the celestial equator. |
| C) The speed of the Earth's revolution is not constant. |
| D) The motion of the apparent sun is along the ecliptic. |
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