Surveying
The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

Horizon and equator
Zenith and pole
Pole and horizon
Equator and zenith

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Surveying
Sidereal day

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

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

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

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