physics or astronomy: a secondary influence on a system that causes it to deviate slightly
What qualifying considerations allayed his perturbations?
…softer skin if unexpectedly encountering female acquaintances in remote places at incustomary hours: quiet reflections upon the course of the day: a cleaner sensation when awaking after a fresher sleep since matutinal noises, premonitions and perturbations, a clattered milkcan, a postman’s double knock, a paper read, reread while lathering, relathering the same spot, a shock, a shoot, with thought of aught he sought though fraught with nought might cause a faster rate of shaving and a…
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If the perturbations are small, the procedure should work.
The planet, Neptune, was discovered after its existence was predicted by perturbations in Uranus’ orbit.