航海英語天文航海單項選擇題每日一練(2019.01.10)

來源：考試資料網(wǎng)

1 A sidereal day is shorter than a solar day. This difference is due to（）.

2 In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.

3 Diurnal aberration is due to（）.

4 In low latitudes，a first quarter Moon will always rise at about（）.

5 Mars will not be visible（）.