## 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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