A rotation is a circular movement of an object around a center (or point) of rotation. A three-dimensional object rotates always around an imaginary line called a rotation axis. If the axis is within the body, and passes through its center of mass the body is said to rotate upon itself, or spin. A rotation about an external point, e.g. the Earth about the Sun, is called a revolution or orbital revolution, typically when it is produced by gravity.

Mathematically, a rotation is a rigid body movement which, unlike a translation, keeps a point fixed. This definition applies to rotations within both two and three dimensions (in a plane and in space, respectively.)

All rigid body movements are rotations, translations, or combinations of the two.

A rotation is simply a progressive radial orientation to a common point. That common point lies within the axis of that motion. The axis is 90 degrees perpendicular to the plane of the motion. If the axis of the rotation lies external of the body in question then the body is said to orbit. There is no fundamental difference between a “rotation” and a “orbit” and or "spin". The key distinction is simply where the axis of the rotation lies, either within or without a body in question. This distinction can be demonstrated for both “rigid” and “non rigid” bodies.

Tauheed Epps (born September 12, 1976), better known by his stage name 2 Chainz, formerly known as Tity Boi, is an American rapper from College Park, Georgia. He was previously signed to Ludacris' record label Disturbing tha Peace with Dolla Boy as Playaz Circle.

2 Chainz was born Tauheed Epps on September 12, 1976. He was originally known under the name "Tity Boi", a name given to him by his mother, as Epps was an only child and thus the only one his mother would breastfeed. Further research and investigation showed that he had one brother named Dimatri who was 9 months younger than him and adopted by a couple in Birmingham, Alabama. His brother has one daughter named Sakia and one son named Dimatri Jr. nicknamed, DJ. His niece, Sakia is 13 (2011) and his nephew, DJ is 2 (2011). His niece is very proud of her uncle and talks to him alot on the phone. She also loves to visit him on her breaks.

His graduating record in college was a 4.0

Epps formed the hip hop duo Playaz Circle (the word "Playaz" being an acronym of Preparing Legal Assets for Years from A to Z) in College Park, Georgia in 1997 with his high school friend Earl Conyers, who became known under his recording name Dolla Boy. Following the release on an independent album titled United We Stand, United We Fall, the duo were introduced to fellow rapper Ludacris when he moved into their College Park apartment complex whilst he was acting as a disc jockey: after he took an interest in Playaz Circle, he began to record several songs with the group, playing some of them on his radio station.

Cameron Jibril Thomaz (born September 8, 1987), better known by the stage name Wiz Khalifa, is an American rapper. He released his debut album, Show and Prove, in 2006, and signed to Warner Bros. Records in 2007. His Eurodance-influenced single, "Say Yeah", received urban radio airplay, charting on the Rhythmic Top 40 and Hot Rap Tracks charts in 2008. Khalifa parted with Warner Bros. and released his second album, Deal or No Deal, in November 2009. He released the mixtape Kush and Orange Juice as a free download in April 2010; he then signed with Atlantic Records. He is also well known for his debut single for Atlantic, "Black and Yellow", which peaked at number 1 on the Billboard Hot 100. His debut album for the label, Rolling Papers, was released on March 29, 2011.

Khalifa was born on September 8, 1987 to a mother and a father serving in the military. His parents divorced when Khalifa was about three years old. His parents' military service caused him to move regularly: Khalifa lived in Germany, the United Kingdom, and Japan before settling in Pittsburgh where he attended Taylor Allderdice High School.

Herbert "Herb" Alpert (born March 31, 1935) is an American musician most associated with the group variously known as Herb Alpert & the Tijuana Brass, Herb Alpert's Tijuana Brass, or TJB. He is also a recording industry executive — he is the "A" of A&M Records (a recording label he and business partner Jerry Moss founded and eventually sold to Polygram). The multi-talented Alpert has also created abstract expressionist paintings and sculpture over two decades, which are on occasion publicly exhibited; and he and his wife are substantial US philanthropists through the operation of the Herb Alpert Foundation.

Alpert's musical accomplishments include five number one hits, 28 albums on the Billboard charts, eight Grammy Awards, fourteen Platinum albums and fifteen Gold albums. As of 1996, Alpert had sold 72 million albums worldwide. Alpert is the only recording artist to hit #1 on the U.S. Billboard Hot 100 pop chart as both an instrumentalist ("Rise", 1979) and vocalist (" This Guy's in Love With You", 1968).