Keywords: Moon apsidal precession.png apsidal precession The image shows the rotation of the Moon's orbit within its orbital plane i e the axes of the ellipse are changing their orientation Distances and sizes are not to scale <br><br> The Moon's major axis “ the longest diameter of the orbit joining its nearest and farthest points the perigee and apogee respectively “ makes one complete revolution about every 8 85 Earth years or 3 233 days as it rotates slowly in the same direction as the Moon itself The Moon's apsidal precession is distinct from and should not be confused with its axial precession own 22 August 2015 Created with GIMP Rfassbind Apsidal precession Moon diagrams |