航海英語天文航海單項選擇題每日一練(2019.01.21)

來源：考試資料網(wǎng)

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

2 A parallax correction is NOT applied to observations of the（）.

3 Superior conjunction occurs when（）.

4 Perihelion is the point where the Sun（）.

5 Sidereal time is NOT used（）.