Surveying
The position of a heavenly body on the celestial sphere can be completely specified by

Its declination and right ascension
Its altitude and azimuth
Its declination and hour angle
All listed here

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Surveying
Contour interval is

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

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Surveying
Normal tension is that pull which

is used at the time of standardising the tape
neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
makes the correction due to sag equal to zero

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