單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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Superior conjunction occurs when（）.

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Sidereal time is used by navigators when（）.

Sidereal time is NOT used（）.

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