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

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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

单项选择题

Superior conjunction occurs when（）.

A.the Sun is at maximum declination north or south
B.a planet crosses the external plane of the ecliptic
C.the Sun is between the Earth and a planet
D.two planets are in line

单项选择题

Sidereal time is used by navigators when（）.

A.used with the equation of time
B.used in the form of LHA Aries
C.calculating the time of moonrise
D.determining local apparent time