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abstraction > mathematical concept > number > quantity > orbital quantity

orbital quantity
subject			fact

orbital quantity	has definition A quantity used for calculating orbits
	is a kind of quantity
quantity	has unit
number	has value

Kinds of orbital quantity :

• Besselian element (2 facts) - One of several quantities tabulated for the calculation of accurate predictions of an eclipse or occultation for any point on or above the surface of the Earth.
• mean element (2 facts) - One of several elements of an adopted reference orbit (see elements, orbital) that approximates the actual, perturbed orbit. Mean elements may serve as the basis for calculating perturbations.
• orbital element (7 kinds, 43 facts) - One of seven quantities that must be established from observations in order to define the size, shape, and orientation of an orbit in space.
• osculating element (3 facts) - One of several parameters that specifies the instantaneous position and velocity of a celestial body in its perturbed orbit. Osculating elements describe the unperturbed (two-body) orbit that the body would follow if perturbations were to cease instantaneously.