單項(xiàng)選擇題Planetary aberration is due，in part，to（）.

A.refraction of light as it enters the Earth's atmosphere
B.rotation of the Earth on it's axis
C.the body's orbital motion during the time required for its light to reach Earth
D.a false horizon


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1.單項(xiàng)選擇題Perihelion is the point where the Sun（）.

A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line

2.單項(xiàng)選擇題Other than the Sun and Moon，the brightest object in the sky is（）.

A.Sirius
B.Canopus
C.Venus
D.Jupiter

3.單項(xiàng)選擇題Opposition occurs when（）.

A.the Sun，Earth，and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun

4.單項(xiàng)選擇題On mid-ocean waters，the height of a wind-generated wave is not affected by the（）.

A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind

5.單項(xiàng)選擇題Mars will not be visible（）.

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition