航海英語天文航海單項(xiàng)選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

1 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（）.

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

3 Planetary aberration is due，in part，to（）.

4 A variable star is one that（）.

5 Apparent altitude is sextant altitude corrected for（）.