单项选择题
A.Earth B.Sun C.stars D.vernal equinox
Diurnal aberration is due to（）.A.motion of the Earth in...
单项选择题Diurnal aberration is due to（）.
A.motion of the Earth in its orbit B.rotation of the Earth on its axis C.the body's orbital motion during the time required for its light to reach the Earth D.a false horizon
Capella is found in what constellation? （）A.GeminiB.Aur...
单项选择题Capella is found in what constellation? （）
A.Gemini B.Auriga C.Libra D.Crab
Because the actual center of some planets may differ fr...
单项选择题Because the actual center of some planets may differ from the observed center，the navigator applies a correction known as the（）.
A.phase correction B.refraction correction C.semidiameter correction D.augmentation correction
