The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The latitude of the place, is
Answer: Option D
A. contour line
B. horizontal equivalent
C. contour interval
D. contour gradient
A. fB/(H - h)
B. fB/(H - h)²
C. fB/(H + h)
D. fB/(H + h)²
A. Error due to refraction may not be completely eliminated by reciprocal levelling.
B. Tilting levels are commonly used for precision work.
C. The last reading of levelling is always a foresight.
D. All of the above statements are incorrect.