The majority of orbits have two foci and an elliptical shape. According to Kepler's first law, a planet will circle the sun in an elliptical form, with two focal points in internal locations that contribute to the ellipse's shape.
An ellipse has two foci or focal points. A planet's total distance from these 2 focus points remains constant throughout its orbit. An ellipse also contains two symmetry lines. The longest line is the principal axis.
There are two focal points on an ellipse. The plural form of "focus" is foci. Two foci, one focus. The foci are always evenly distributed on each side of the primary axis.
An object is said to be rotating in an elliptical orbit when it travels around another object on an oval-shaped path. All planets circle the sun in elliptical patterns. The Moon similarly travels in an elliptical orbit around the Earth.
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