航海英语天文航海章节练习(2018.02.13)

单项选择题
Other than the Sun and Moon，the brightest object in the sky is（）.
A.Sirius
B.Canopus
C.Venus
D.Jupiter
单项选择题
A large group of stars revolving around a center is known as a（）.
A.cluster
B.shower
C.constellation
D.galaxy
单项选择题
Sidereal time is used by navigators when（）.
A.used with the equation of time
B.used in the form of LHA Aries
C.calculating the time of moonrise
D.determining local apparent time
单项选择题
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
单项选择题
Capella is found in what constellation? （）
A.Gemini
B.Auriga
C.Libra
D.Crab
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
Right ascension is primarily used by the navigator for（）.
A.calculating amplitudes
B.calculating great circle sailings by the Agiton method
C.entering the Air Navigation Tables (Selected Stars) Pub 249
D.plotting on star finders
单项选择题
A correction for augmentation is included in the Nautical Almanac corrections for（）.
A.the Sun
B.the Moon
C.Venus
D.None of the above
单项选择题
Sidereal time is NOT used（）.
A.as the basis for star charts
B.to enter a star finder
C.in sight reduction using Pub 249
D.in sight reductions of planet observations
单项选择题
A semidiameter correction is applied to observations of（）.
A.Mars
B.the Moon
C.Jupiter
D.All of the above