單項(xiàng)選擇題Other than the Sun and Moon,the brightest object in the sky is().

A.Sirius
B.Canopus
C.Venus
D.Jupiter


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1.單項(xiàng)選擇題Opposition occurs when().

A.the Sun,Earth,and Moon are at right angles
B.the Sun's declination is 0°and is moving south
C.an inferior planet is at the maximum angle to the line of sight to the Sun
D.the Earth is between a planet and the Sun

2.單項(xiàng)選擇題On mid-ocean waters,the height of a wind-generated wave is not affected by the().

A.water depth exceeding 100 feet
B.fetch
C.wind's velocity
D.duration of the wind

3.單項(xiàng)選擇題Mars will not be visible().

A.at elongation angles near 180°
B.from quadrature to opposition
C.at conjunction
D.at opposition

4.單項(xiàng)選擇題It is difficult to determine which limb of the Moon is fully illuminated().

A.when the Moon is low in the sky at rising or setting
B.at the new Moon phase
C.when taking Moon sights during daylight
D.when the terminator is nearly vertical

5.單項(xiàng)選擇題In working out a local apparent noon sight for your latitude,you subtract the Ho from 90°. The 90°represents the angular distance from().

A.the equator to the elevated pole
B.your horizon to your zenith
C.your zenith to the elevated pole
D.the geographical position of the Sun to the elevated pole

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使用英版《航海天文歷》高度修正表求取真高度時(shí),所有天體必須修正的是()

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航海六分儀的指標(biāo)差太大會給觀測帶來不便,因此當(dāng)指標(biāo)差大于()時(shí),就應(yīng)該縮小它。

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