(occurring slowly over a long period of time)
Secular, as used in astronomy, indicates occurrence
over a long period of time and not periodic.
It is especially used to discuss the long-term trends
in a motion that is periodic over the shorter term,
such as stating that/how an orbit changes over time.
The term is commonly used in describing dynamics and orbits.
- secular variation or secular motion
- "secular phenomena"
- "secular perturbation"
- "secular chaos"
- "secular acceleration"
- "secular drift"
The term is also used in time series analysis, with an analogous meaning.
Referenced by pages:
gravitational instability (GI)
Laplace-Lagrange secular theory