The object doing the circling is a satellite of the other. The Earth is one of the Sun's satellites.
a planet like our own
The shadow that is casted by one object in space on another is called an Eclipse.
An object composed of dust, ice, and rock which orbits the Sun is called a comet.
The farther an object is from the observer, the smaller its parallax is.
Occultation.
Revolve :)
Circles are a never ending object. They have no starting and no ending point. They have a center point and from the center to the edge of the circle is the same distance around the whole object.
satellite.
epicycles
a cylinder ;)
A cylinder perhaps
it is another way of saying conjoined circles
if you look into the mirror, you will see a glowing object that's floating. While still looking in the mirror, there will be glowing circles on the walls. The object will follow you while you run, and you have to line up the object into the circles.
a planet like our own
Half a torus (a donut/doughnut)
It is a satellite.
i am a sphere