### Field Astronomy

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Field astronomy deals with the determination of the relative positions of the celestial bodies by taking the astronomical observations. Related terms: 1. Celestial sphere: If we assume the space to be a sphere having the earth as its center and all the star lying on its surface, or studded in it. The celestial sphere can be of few kilometers to many thousand kilometer. 2. Zenith and Nadir : These are two points on the celestial sphere opposite to each other and lying above and below the observer. Zenith is the point on the celestial sphere, above the head of the observer and Zenith is the point on the celestial sphere below the observer. Alternatively, these are the points of intersection of the plumb line(drawn through the point of observation) with the celestial sphere.

3.Terrestrial poles and equator: Terrestrial poles are the points of intersection of the axis of rotation of the earth with the earth sphere, and the terrestrial equator is the great circle of the earth which is pe…

Field astronomy deals with the determination of the relative positions of the celestial bodies by taking the astronomical observations. Related terms: 1. Celestial sphere: If we assume the space to be a sphere having the earth as its center and all the star lying on its surface, or studded in it. The celestial sphere can be of few kilometers to many thousand kilometer. 2. Zenith and Nadir : These are two points on the celestial sphere opposite to each other and lying above and below the observer. Zenith is the point on the celestial sphere, above the head of the observer and Zenith is the point on the celestial sphere below the observer. Alternatively, these are the points of intersection of the plumb line(drawn through the point of observation) with the celestial sphere.

3.Terrestrial poles and equator: Terrestrial poles are the points of intersection of the axis of rotation of the earth with the earth sphere, and the terrestrial equator is the great circle of the earth which is pe…