单项选择题
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
Perihelion is the point where the Sun（）.A.is nearest to...
单项选择题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
Other than the Sun and Moon，the brightest object in the...
单项选择题Other than the Sun and Moon，the brightest object in the sky is（）.
A.Sirius B.Canopus C.Venus D.Jupiter
Opposition occurs when（）.A.the Sun，Earth，and Moon are a...
单项选择题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
