单项选择题
As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.
A.elongation
B.conjunction
C.opposition
D.quadrature
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Apparent altitude is sextant altitude corrected for（）.
A.parallax and personal error
B.inaccuracies in the reading and reference level
C.visibility and magnitude
D.All of the above are correct -
单项选择题
An amplitude of the Sun in high latitudes（）.
A.is most accurate before sunrise
B.is most accurate after sunset
C.should only be observed when the Sun's lower limb is above the horizon
D.is most accurate when the Sun's center is observed on the visible horizon -
单项选择题
Altair is found in what constellation?（）
A.Hercules
B.Cygnus
C.Aquila
D.Capricorn
