Term

Definition
An imaginary sphere of infinite radius with the Earth at its center 


Term
Celestial North/South Poles 

Definition
Extension of earths north and south poles 


Term

Definition
Great circle between north and south poles 


Term

Definition
Great circle between north and south poles does not rotate with celestial sphere 


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Definition
Great circle through the celestial poles that rotates with the celestial sphere 


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Definition
Extension of earths prime meridian on the celestial sphere 


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Definition
extension of earths equator on the celestial sphere 


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Definition
Angle from celestial equator. similar to latitude 


Term

Definition
Angular distance from Prime celestial meridian. like longitude 


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Definition
Greenwich hour angle. Angle of object from prime celestial meridian to the object going west 


Term

Definition
Local Hour angle. angle of object from local meridian to object going west up to 360 


Term

Definition
Similar to LHA but going west from the local meridian to the object 


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Definition
An Hour Circle used as a reference point for the Celestial Sphere. SHA of all stars are measured from this reference point. 


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Definition
The angular distance of the Hour Circle of Aries measured westward from the Celestial Prime Meridian 


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Definition
Sidereal Hour Angle. The angular distance of the Hour Circle of the Star measured westward from the Hour Circle of Aries. Like "t" but from Aries. 


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Definition
Your position project out into the celestial sphere 


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Definition


Term

Definition
Geographic position. position of the celestial object projected onto the earth 


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Definition
Axis that goes through the earth connecting the zenith and nadir. used in horizon system 


Term

Definition
Line perpendicular to the zenith nadir axis 


Term

Definition
A great circle on the celestial sphere passing through the observer’ s zenith and nadir, perpendicular to the plane of the celestial horizon 


Term
Principle Vertical Circle 

Definition
Coincides with the projected terrestrial meridian passing through their position 


Term

Definition
Angular distance of a point on the celestial sphere above a designated reference horizon, measured along the vertical circle passing through point 


Term

Definition
Horizontal angle measured along the celestial horizon in a clockwise direction from 000°T to 360°T from the Principal Vertical circle to the vertical circle passing through a given point or body on the celestial sphere 


Term

Definition
The Terrestrial, celestial, and the horizon coordinate systems are combined on the celestial sphere, forming the Celestial Triangle. The Celestial Triangle is the basis of celestial navigation. 


Term

Definition
Abbreviated Z. The angle at the zenith between the projected celestial meridian of the observer and the vertical circle passing through the body. Measured 0° through 180°, East or West. Used to find the Celestial Body’s True Bearing. 


Term

Definition
The angle measured East or West from the observer’s celestial meridian to the hour circle of the body. LHA is the Meridian Angle measured Westward through 360. t is the Meridian Angle measured Eastward 


Term

Definition
The corresponding triangle to the Celestial Triangle located on the Terrestrial Sphere. This triangle is used to simplify calculations for position on the Terrestrial Sphere. Meridian Angle and Zenith Angle are also the same in this triangle as they are in the Celestial Triangle 

