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semiminor axis
subjectfact 
semiminor axishas definition Half the length of the minor axis of an ellipse; a standard element used to describe an elliptical orbit.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:26.0
is an instance of length2001-09-27 09:33:26.0
lengthhas unit length unit2001-09-27 09:33:26.0
numberhas value2001-09-27 09:32:57.0