单项选择题
A group of stars which appear close together and form a striking configuration such as a person or animal is a（）.
A.cluster
B.shower
C.constellation
D.galaxy
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单项选择题
A first magnitude star is（）.
A.2.5 times as bright as a second magnitude star
B.3 times as bright as a second magnitude star
C.5 times as bright as a second magnitude star
D.10 times as bright as a second magnitude star -
单项选择题
A double star is a star that（）.
A.has a declination equal to twice that of the Sun
B.comprises two stars that appear close together
C.is twice as bright as a single star
D.suddenly becomes much brighter and then fades -
单项选择题
A correction for augmentation is included in the Nautical Almanac corrections for（）.
A.the Sun
B.the Moon
C.Venus
D.None of the above
