Still , there are secular phenomena that have to be dealt with by post-Newtonian methods .
The equations of motion of the moons , planets and other bodies are known with great accuracy , and are used to generate tables for celestial navigation .
There are secular phenomena that have to be dealt with by post-Newtonian methods .
The equations of motion of the moons , planets and other bodies are known with great accuracy , and are used to generate tables for celestial navigation .