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?glossary&term=sma
?glossary&term=sma
http://ssd.jpl.nasa.gov/?glossary&term=sma
semi-major axis of an orbit
P973
P2233-3510619f-45cd-fbb5-dda8-898d654224ec
P973
?glossary&term=sma
http://ssd.jpl.nasa.gov/?glossary&term=sma