单选题Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.AGreenwich celestial meridianBhour circle of the bodyClocal celestial meridianDvertical circle of the body
单选题
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
A
Greenwich celestial meridian
B
hour circle of the body
C
local celestial meridian
D
vertical circle of the body
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