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?（）<br>A:The motion of the apparent sun is along the ecliptic<br>B:Measurement of time is along the celestial equator<br>C:The speed of the Earth's revolution is not constant<br>D:There are variations in the Earth's rotational speed

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:The motion of the apparent sun is along the ecliptic
B:Measurement of time is along the celestial equator
C:The speed of the Earth's revolution is not constant
D:There are variations in the Earth's rotational speed

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