Surveying
The position of a heavenly body on the celestial sphere can be completely specified by

Its declination and hour angle
All listed here
Its altitude and azimuth
Its declination and right ascension

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Surveying
The meridian of a place is

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
An arc of the great circle which passes through the place and is perpendicular to the equator

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Surveying
Sidereal day

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

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