## 91. Height of instrument method of levelling is

## 92. The slotted template method

## 93. When a star is between the pole and the horizon, the relationship between latitude (λ), zenith distance (z) and declination δ, is

## 94. The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

## 95. The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

## 96. Which of the following is not used in measuring perpendicular offsets ?

## 97. The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

## 98. Right ascension of a heavenly body is its equatorial angular distance measured

## 99. $$\alpha $$ and $$\beta $$ are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is

## 100. The method of surveying by triangulation was first introduced by the Dutchman Snell in

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