單項選擇題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


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題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

2.單項選擇題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

3.單項選擇題Altair is found in what constellation?（）

A.Hercules
B.Cygnus
C.Aquila
D.Capricorn

4.單項選擇題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

5.單項選擇題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