61. Sidereal day
62. In a tropical year, the numbers of sidereal days are
63. In a tropical year, the numbers of sidereal days are
64. The point on the celestial sphere vertically below the observer's position, is called
65. The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called
66. The type of surveying which requires least office work is
67. During chaining along a straight line, the . leader of the party has 4 arrows in his hand while the follower has 6. Distance of the follower from the starting point is
68. The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be
69. Subtense bar is an instrument used for
70. Cross staff is an instrument used for
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