单选题Sidereal time is NOT used（）.Aas the basis for star chartsBto enter a star finderCin sight reduction using Pub 249Din sight reductions of planet observations
单选题
Sidereal time is NOT used（）.
A
as the basis for star charts
B
to enter a star finder
C
in sight reduction using Pub 249
D
in sight reductions of planet observations
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