The angle at the pole measured through 180°from the prime meridian to the meridian of a point is known as（）.<br>A:the departure<br>B:the polar arc<br>C:longitude<br>D:Greenwich hour angle

The angle at the pole measured through 180°from the prime meridian to the meridian of a point is known as（）.
A:the departure
B:the polar arc
C:longitude
D:Greenwich hour angle

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