Surveying
The rate of change of parallax dp/dh with respect to change in h, may be expressed as

fB/(H - h)
fB/(H + h)
fB/(H - h)²
fB/(H + h)²

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Surveying
Circumpolar stars

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

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