航海英語天文航海單項(xiàng)選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

1 Apparent altitude is sextant altitude corrected for（）.

2 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（）.

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3 The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used（）.

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4 A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.

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

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