航海英語天文航海單項選擇題每日一練(2019.01.12)

來源：考試資料網(wǎng)

1 Altair is found in what constellation?（）

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

3 A variable star is one that（）.

4 A body can only be observed at lower transit when（）.

5 Superior conjunction occurs when（）.