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abstraction > mathematical concept > number > quantity > length > semimajor axis

semimajor axis (a)
subject			fact

semimajor axis	has symbol a
	has definition An orbital element representing half the length of the major axis of an ellipse.
	is an instance of orbital element
	is an instance of length
orbital element	is required to define the size, shape, and orientation of an orbit in space
	see also mean element
	see also osculating element
length	has unit length unit
number	has value