单选题A time diagram is a diagram of the celestial sphere as observed from above the（）.Asouth celestial poleBnorth celestial poleCobserver's meridianDGreenwich meridian
单选题
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A
south celestial pole
B
north celestial pole
C
observer's meridian
D
Greenwich meridian
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