71. Longitudes are measured from 0° to
72. If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer then the hour angle of the star at elongation is given by
73. If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer, then the azimuth of the star at elongation is given by
74. The altitude of a circumpolar star is maximum when it is
75. Rotation of the camera at exposure about its vertical axis, is known as
76. The angle between the observer's meridian and declination circle of a heavenly body, is known as
77. A metallic tape is made of
78. If S is the sum of three angles of a spherical triangle, the spherical excess equals
79. The suitable contour interval for a map with scale 1 : 10000 is
80. Which of the following methods of plane table surveying is used to locate the position of an inaccessible point ?
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