Surveying
The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is

50°
70°
80°
60°

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Surveying
Contour interval is

Directly proportional to the flatness of ground
Inversely proportional to the scale of the map
Larger for accurate works
Larger if the time available is more

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