单项选择题

The angle measured at the observer’s meridian from the elevated pole，clockwise or counterclockwise up to 180°，to the vertical circle of the body is the（）.

A.local hour angle
B.azimuth angle
C.meridian angle
D.longitude

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单项选择题

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

单项选择题

The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used（）.

A.when the declination and latitude are of different names
B.when the declination is greater than and the same name as the latitude
C.if the vessel is stopped or making bare steerageway
D.on a fast vessel on northerly or southerly headings