航海英語天文航海單項選擇題每日一練(2019.01.14)

來源：考試資料網(wǎng)

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

2 A large group of stars revolving around a center is known as a（）.

3 An amplitude of the Sun in high latitudes（）.

4 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（）.

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