In class, we've been assigned a project over astronomy. We have graphed an equation for 6 of Jupiter's moons and the planets (separately), and the equation was a power equation T=ar^b. T is the orbital period of the moon or planet, r is the distance from the planet (or sun), and a and b are constants that we've determined. We also have to include a discussion on the three main laws that describe the motion of heavenly bodies, who they are named for, why s/he is the one that gets this honor, and which of the laws pertains to the calculations done here. The part I need help with pertains to the laws. I believe they are Kepler's laws, but I don't know why Kepler got the honor or which law pertains to the calculations (or equation). Any help?