Surveying
‘H’ is the flying height above mean ground level and ‘f’ is the principal distance of a vertical photograph. The mean scale of the photographs is

H + f
H. f
H/f
f/H

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Surveying
The First Point of Aeries

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

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