Secular motion. Secular variations in the motions of the planets are those that have very slow changes that proceed through ages (secula) in a way such that they are nearly proportional with time for a relatively large number of years.
which, like a wobbling top, traces out a pair of cones joined at their apices in a cycle of approximately 26,000 years (called a Great or Platonic Year in astrology). The term "precession" typically refers only to this largest secular motion; ...
The rate of motion is slightly variable from century to century owing to the secular motion of the plane of the ecliptic.
  
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