Surveying
The parallax equation Δp = BmΔh/H - h is applicable to entire overlap of the photographs only if parallax is measured

Both (A) and (B)
Neither (A) nor (B)
Parallel to base line
Normal to base line

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Surveying
Circumpolar stars

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

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