航海英語天文航海單項(xiàng)選擇題每日一練(2019.01.22)

來源：考試資料網(wǎng)

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

2 During one synodic rotation，a body makes one complete turn relative to the（）.

3 The angle measured at the observer’s meridian from the elevated pole，clockwise or counterclockwise up to 180°，to the vertical circle of the body is the（）.

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4 Right ascension is primarily used by the navigator for（）.

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5 A sidereal day is approximately how much shorter than a solar day?（）

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