Focus, Vacant - One of
the foci found in an orbital ellipse

Gravitational Constant, G - Newton's derived constant of gravitation:
6.62759E-20km^3/kg-s^2

Hyperbola - The conic
created by the planar intersection of two opposite facing cones

Inclination - The
angle between the reference plane(or ecliptic) and an intersecting orbit

Node, Ascending -
The rising edge through the Line of Nodes

Node, Descending -
The falling edge through the Line of Nodes

Node, Line of - The
line of intersection between two planes

Parabola - The conic
created by a planar intersection of a cone parallel to its sides

Periaps - The closest
distance in an ellipse from the sun

Periaps, Argument of
- The angle, in the plane of the satellite's orbit, between the ascending node
and the periapsis point, measured in the direction of the satellite's motion

Rising Node, Longitude of
- The angle, in the plane of reference, from the First Point in Aries to the Ascending
Node on the line of intersection between two orbits (the Line of Nodes).

Semi-Labus Rectum
- The line perpindicular to the semi-major axis that intersects the prime focus.