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

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

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Surveying
The difference between a level line and a horizontal line is that

both are same
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line

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Surveying
The meridian of a place is

An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
A semi-circle which passes through the place and is terminated at the poles

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