单选题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?（）AThe motion of the apparent sun is along the eclipticBMeasurement of time is along the celestial equatorCThe speed of the Earth's revolution is not constantDThere are variations in the Earth's rotational speed
单选题
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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