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)²
fB/(H + h)²
fB/(H + h)

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day
All listed here
Is the period of time taken by the earth in making a complete rotation with reference to stars

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