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

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

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Surveying
The First Point of Aeries

Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here

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