Surveying
If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is

100.345 m
101.870 m
100.655 m
99.345 m

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Surveying
Circumpolar stars

Rotate round the North Pole
Rotate round the celestial pole
Remain always above the horizon
Are seldom seen near the pole star

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