The Apollo 9 Earth orbit mission was launched into the nominal orbit consistent with Apollo 11, but the spacecraft were able to use their own engines to raise the perigee high enough to sustain the 10-day mission.
Zemljina orbitalna misija Apollo 9 lansirana je u nominalnu orbitu u skladu s Apollo 11, no letjelica je uspjela iskoristiti vlastite motore kako bi podigle perigee dovoljno visoko da održi 10-dnevnu misiju.