A time diagram is a diagram of the celestial sphere as observed from above the（）.<br>A:south celestial pole<br>B:north celestial pole<br>C:observer's meridian<br>D:Greenwich meridian

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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