單項(xiàng)選擇題After Venus passes the point of greatest elongation east in its orbit，the first position in which the elongation will be zero is（）.

A.superior conjunction
B.inferior conjunction
C.opposition
D.None of the above; the elongation will never be zero


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1.單項(xiàng)選擇題A variable star is one that（）.

A.exhibits a change in magnitude
B.has a changing declination
C.is increasing in SHA
D.is also known as a red giant

2.單項(xiàng)選擇題A star that suddenly becomes several magnitudes brighter and then gradually fades is a（）.

A.double star
B.variable star
C.nova
D.nebula

3.單項(xiàng)選擇題A star is observed at lower transit. The line of position derived from this sight is（）.

A.on the prime vertical
B.a latitude line
C.a longitude line
D.of no special significance

4.單項(xiàng)選擇題A sidereal day is shorter than a solar day. This difference is due to（）.

A.irregularities in the daily rotational rate of the Sun
B.the space motion of the solar system
C.the precession of the equinoxes
D.the use of different reference points

5.單項(xiàng)選擇題A sidereal day is approximately how much shorter than a solar day?（）

A.4 minutes
B.8 minutes
C.12 minutes
D.16 minutes