航海英语天文航海章节练习(2018.02.07)

单项选择题
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
单项选择题
Perihelion is the point where the Sun（）.
A.is nearest to the Earth
B.is farthest from the Earth
C.is on the opposite side of the Earth from the Moon
D.and Moon and Earth are in line
单项选择题
A star is observed at lower transit. The line of position derived from this sight is（）.
A.on the prime vertical
B.a latitude line
C.a longitude line
D.of no special significance
单项选择题
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
单项选择题
A variable star is one that（）.
A.exhibits a change in magnitude
B.has a changing declination
C.is increasing in SHA
D.is also known as a red giant
单项选择题
Planetary aberration is due，in part，to（）.
A.refraction of light as it enters the Earth's atmosphere
B.rotation of the Earth on it's axis
C.the body's orbital motion during the time required for its light to reach Earth
D.a false horizon
单项选择题
Capella is found in what constellation? （）
A.Gemini
B.Auriga
C.Libra
D.Crab
单项选择题
A parallax correction is NOT applied to observations of the（）.
A.stars
B.Moon
C.Sun
D.Planets
单项选择题
In order for a star to be used for a sight at lower transit，the star must（）.
A.be circumpolar
B.have a declination equal to or greater than your latitude
C.have a GHA of 180°
D.have the SHA equal to or less than the LHA
单项选择题
A phase correction is applied to observations of（）.
A.the Sun
B.stars
C.planets
D.All of the above