Surveying
The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

B = bH/f
B = H/bf
B =f/bH
B = b/fH

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Surveying
Circumpolar stars

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

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