A、the primary great circle of the Earth perpendicular to the axis
B、the line to which all celestial observations are reduced
C、the line from which a celestial body's altitude is measured
D、All of the above
更多“The equator is（）.”相关的问题
A、the lines of force cross the equator on a 0°-180°alignment B、the quadrantal error is 0° C、there is no vertical component of the Earth's magnetic field D、the intercardinal headings have less than 1°
A、increases with latitude，being maximum at the geographic poles B、decreases with latitude，being maximum at the geographic equator C、is greatest when a vessel is near the Earth's magnetic equator D、remains the same at all latitudes
A、A.180E above the equator B、B.64.5 E over the IOR C、C.15.5W along the straight line D、D.55.5W above the equator
A、needles are nearly in line with the meridian B、vessel is near the magnetic poles C、variation is near zero D、vessel is near the magnetic equator
A、A.The two points are in low latitudes in the same hemisphere B、B.The two points are in high latitudes in the same hemisphere C、C.The two points are near the equator, but in different hemispheres D、D.One point is near the equator, one point is in a high latitude, and both are near the 180th meridian
A、it is just east of the International Date Line B、it is just west of the International Date Line C、it is located halfway between the equator and the South Pole D、it is located in the Southern Pacific Ocean
A、and Moon and Earth form a right angle B、and Moon and Earth are in line C、crosses the celestial equator D、is farthest from the Earth
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