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單項選擇題

In order for a star to be used for a sight at lower transit，the star must（）.

A.be circumpolar
B.have a declination equal to or greater than your latitude
C.have a GHA of 180°
D.have the SHA equal to or less than the LHA

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單項選擇題

In low latitudes，a first quarter Moon will always rise at about（）.

A.sunrise
B.1200 LMT
C.sunset
D.2400 LMT

單項選擇題

In general，the most effective period for observing stars and planets occurs during the darker limit of（）.

A.sunset
B.civil twilight
C.nautical twilight
D.astronomical twilight