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abstraction > mathematical concept > number > quantity > length > semimajor axis
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semimajor axis comparison table
Subject is an instance of has unit see also is a kind of has symbol has definition is requir
length length unit quantity   
orbital element  osculating elementorbital quantity One of seven quantities that must be established from observations in order to define the size, shape, and orientation of an orbit in space.to define the size, shape, and orientation of an orbit in space
semimajor axislengthlength unitosculating element aAn orbital element representing half the length of the major axis of an ellipse.to define the size, shape, and orientation of an orbit in space

Next lengthsemiminor axis    Uplength, orbital element    Previous lengthradius