641. Places having same latitude
A. lie on the parallel of the latitude
B. are equidistant from the nearer pole
C. are equidistant from both the poles
D. all the above.

642. The length of a ,parallel of X latitude between two meridians is equal to difference in logitudes multiplied by
A.(a ) sin X
B. cos X
C. tan X
D. cot X.

643. A nautical mile is
A. one minute arc of the great circle passing through two points
B. one minute arc of the longitude
C. 6080 ft
D. all the above.

644. The longitudes of two places at latitude 60? N are 93? E and 97? W. Their departure is
A. 5100 nautical miles
B. 5700 nautical miles
C. 120 nautical miles
D. 500 nautical miles

645. Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.
A. by subtracting their longitudes if places are in the same hemisphere
B. by adding their longitudes if places are in the different hemispheres
C. by subtracting the sum of their longitudes exceeding 180? from 360? if places are in different hemispheres
D. all the above.

646. The shortest distance between two places measured along the surface of the earth, is
A. length of the equator between their longitudes
B. length of the parallel between their longitudes
C. length of the arc of the great circle passing through them
D. none of these.

647. The zenith is the point on the celestial sphere
A. east of observer
B. west of observer
C. north of observer
D. south of observer

648. The point on the celestial sphere vertically below the observer’s position, is called
A. zenith
B. celestial point
D. pole.

649. The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called
A. rational horizon
B. true horizon
C. celestial horizon
D. all the above.

650. The circle in which a plane tangent to the earth’s surface at the point of observation, intersects the celestial sphere, is called
A. visible horizon
B. sensible horizon
C. celestial horizon
D. true horizon

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