Surveying
The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

Declination and altitude system
Altitude and azimuth system
Declination and hour angle system
Declination and right ascension system

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Surveying
The cross hairs in the surveying telescope are placed

anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens
much closer to the objective lens than to the eye piece
much closer to the eye-piece than to the objective lens

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