Which description tells the length of time it takes for a planet to revolve around the sun? a. the length of its year b. the length of its day c. the length of its month d. the length of its decade which term best describes the shape of jupiter's orbit around the sun? a. complex b. irregular c. ellipse d. circle planets in our solar system do not revolve around the sun in perfect circles. their orbits are more like ovals. which term do scientists use to describe these orbits? a. revolutionary b. rotational c. periodical d. elliptical which phrase describes a planet’s period of rotation? a. the shape of its orbit b. its tilt relative to the sun c. one complete spin on its axis d. one complete orbit around the sun