the sun and mercury should be like any other body in the system. you know each is affected by all the others. just add up the vectors in each cycle and apply it (minus the vector of what it applies to) to each and repeat. another hint is to sort your list by body mass, so you are adding in the order small to large. that helps avoid some rounding errors.
Tradition is peer pressure from dead people
What do you call someone who speaks three languages? Trilingual. Two languages? Bilingual. One language? American.
What do you call someone who speaks three languages? Trilingual. Two languages? Bilingual. One language? American.