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The position of the body on its orbit when it has the same celestial longitude as the sun



Related Terms

OPPOSITION

The situation of two celestial bodies having either celestial longitudes or sidereal hour angles differing by 180°. The term is usually used only in relation to the position of a superior planet or the moon with reference to the sun. The situation of two celestial bodies having either the same celestial longitude or the same sidereal hour angle is called conjunction.

G.H.A

Greenwich hour angle is the celestial longitude measured from Greenwich to 360 degrees westward.

GHA

Greenwich hour angle is the celestial longitude measured from Greenwich to 360 degrees westward.

LONGITUDE FACTOR

The change in longitude along a celestial line of position per 1' change in latitude. The change in latitude for a 1' change in longitude is called LATITUDE FACTOR.

LONGITUDE METHOD

The establishing of a line of position from the observation of the latitude of a celestial body by assuming a latitude (or longitude), and calculating the longitude (or latitude) through which the line of position passes, and the azimuth. The line of position is drawn through the point thus found, perpendicular to the azimuth.

OSCULATING ELEMENTS

A set of parameters that specifies the instantaneous position and velocity of a celestial body, or artificial satellite in a perturbed orbit. Osculating elements describe the unperturbed (two- body) orbit (osculating orbit) that the body would follow if perturbations were to cease instantaneously.

HIGH ALTITUDE METHOD

The establishing of a circular line of position from the observation of the altitude of a celestial body by means of the geographical position and zenith distance of the body. The line of position is a circle having the geographical position as its center and a radius equal to the zenith distance. The method is normally used only for bodies at high altitudes having small zenith distances. METHOD LONGITUDE METHOD. high clou

CONJUNCTION

The situation of two celestial bodies having either the same celestial longitude or the same sidereal hour angle. A planet is at superior conjunction if the sun is between it and the earth; at inferior conjunction if it is between the sun and the earth. The situ- ation of two celestial bodies having either celestia

LATITUDE FACTOR

The change in latitude along a celestial line of position per 1' change in longitude. The change in longitude for a 1' change in latitude is called LONGITUDE FACTOR.

PERTURBATIONS

In celestial mechanics differences of the actual orbit from a central force orbit, arising from some external force such as a third body attracting the other two; a resisting medium (atmosphere); failure of the parent body to act as a point mass, and so forth. Also the forces that cause differences between the actual and reference (central force) orbits.

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