A celestial body will cross the prime vertical circle when the latitude is numerically ______.A.greater than the declination and both are of the same nameB.less than the declination and both are of the same nameC.greater than the declination and both are of contrary nameD.less than the declination and both are of contrary name
A celestial body will cross the prime vertical circle when the latitude is numerically ______.
A.greater than the declination and both are of the same name
B.less than the declination and both are of the same name
C.greater than the declination and both are of contrary name
D.less than the declination and both are of contrary name
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单选题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.Anorth magnetic poleBsouth magnetic poleCmagnetic prime vertical meridianDmagnetic equator
单选题A line of position from a celestial observation is a segment of a （）.Acircle of equal altitudeBparallel of declinationCparallel of altitudeDvertical circle
单选题Solid green arrows on the main body of a pilot chart indicate （）.Aprevailing wind directionsBprevailing ocean current directionsCprobable surface current flowDshortest great circle routes
单选题A star is observed at lower transit. The line of position derived from this sight is（）.Aon the prime verticalBa latitude lineCa longitude lineDof no special significance
单选题The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.Ahorizontal parallax decreasesBobserver's height above sea level increasesChumidity of the atmosphere decreasesDaltitude of the body decreases
单选题The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）AThe Flinders barBThe heeling magnetCQuadrantal soft iron spheresDBar magnets in the binnacle
单选题A time diagram is a diagram on the plane of the（）.Acelestial meridianBcelestial equatorCcelestial horizonDprincipal vertical circle
单选题A great circle track provides the maximum saving in distance on（）.Aeasterly courses in high latitudesBsoutherly courses in high latitudesCwesterly courses in low latitudesDeasterly courses in low latitudes that cross the equator
单选题The equator is（）.Athe primary great circle of the Earth perpendicular to the axisBthe line to which all celestial observations are reducedCthe line from which a celestial body's altitude is measuredDAll of the above
单选题The most accurate method of determining gyrocompass error while underway is by（）.AComparing the gyro azimuth of a celestial body with the computed azimuth of the bodyBComparing the gyro heading with the magnetic compass headingCDetermining from the chart the course made good between celestial fixesDIt cannot be determined accurately at sea due to drift of unknown currents
单选题A latitude line will be obtained by observing a body （）.Aon the prime verticalBon the celestial horizonCat lower transitDon the Greenwich meridian
单选题A celestial body’s complete orbit around another body is（）.Aa rotationBa revolutionCspace motionDnutation
单选题A celestial body will cross the prime vertical circle when the latitude is numerically （）.AGreater than the declination and both are of the same nameBLess than the declination and both are of the same nameCGreater than the declination and both are of contrary nameDLess than the declination and both are of contrary name
单选题The directive force of a gyrocompass（）.Aincreases with latitude，being maximum at the geographic polesBdecreases with latitude，being maximum at the geographic equatorCis greatest when a vessel is near the Earth's magnetic equatorDremains the same at all latitudes
单选题Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.AGreenwich celestial meridianBhour circle of the bodyClocal celestial meridianDvertical circle of the body
单选题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（）.Alocal hour angleBazimuth angleCmeridian angleDlongitude
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单选题When out of sight of land, a ship’s position can be found by using（）.Athe coastal navigationBthe celestial navigationCtraditional navigationDthe great circle navigation