How can I make an object spin around another object?

Um. This is actually really simple but it depends. Laying them out is easy correct? But this is what I would do.

local part1 = sun
local part2 = world

while true do
    wait()
    for i = 1,360 do
        part2.CFrame = part1.CFrame
                     * CFrame.new(0,0,5)
                    * CFrame.Angles(0,math.rad(i),0)
    end
end

So what happens is, you put the world's cframe relative to the postion of the sun. This just makes it go in circles 5 studs away from the sun. I'm thinking of the top of my head so I'm not sure if it will orbit the sun or just spin in circles. It's one or the other.