Term
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Definition
| An imaginary sphere of infinite radius with the Earth at its center |
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Term
| Celestial North/South Poles |
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Definition
| Extension of earths north and south poles |
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Term
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Definition
| Great circle between north and south poles |
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Term
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Definition
| Great circle between north and south poles does not rotate with celestial sphere |
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Term
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Definition
| Great circle through the celestial poles that rotates with the celestial sphere |
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Term
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Definition
| Extension of earths prime meridian on the celestial sphere |
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Term
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Definition
| extension of earths equator on the celestial sphere |
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Term
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Definition
| Angle from celestial equator. similar to latitude |
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Term
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Definition
| Angular distance from Prime celestial meridian. like longitude |
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Term
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Definition
| Greenwich hour angle. Angle of object from prime celestial meridian to the object going west |
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Term
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Definition
| Local Hour angle. angle of object from local meridian to object going west up to 360 |
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Term
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Definition
| Similar to LHA but going west from the local meridian to the object |
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Term
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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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Term
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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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Term
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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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Term
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Definition
| Your position project out into the celestial sphere |
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Term
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Definition
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Term
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Definition
| Geographic position. position of the celestial object projected onto the earth |
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Term
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Definition
| Axis that goes through the earth connecting the zenith and nadir. used in horizon system |
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Term
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Definition
| Line perpendicular to the zenith nadir axis |
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Term
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Definition
A great circle on the celestial sphere passing through the observer’
s zenith and nadir, perpendicular to the plane of the celestial
horizon |
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Term
| Principle Vertical Circle |
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Definition
Coincides with the projected terrestrial meridian passing through
their position |
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Term
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Definition
Angular distance of a point on the celestial sphere above a
designated reference horizon, measured along the vertical circle
passing through point |
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Term
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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 |
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Term
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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. |
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Term
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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. |
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Term
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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 |
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Term
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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 |
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