Surveying
If two points differing by 1° of latitude and of the same longitude is 110 km apart on the earth, then two astronomical positions on the moon is about

10 km
50 km
25 km
30 km

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Surveying
Normal tension is that pull which

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

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