Surveying
For any star to be a circumpolar star, its

Declination must be 0°
Hour angle must be 180°
Declination must be 90°
Distance from the pole must be less than the latitude of the observer

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Surveying
Contour interval is

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

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