6 Degrees Of Wikipedia

Six degrees of Wikipedia is a website which quoted from the website “allows you to find the shortest hyperlinked paths between any two pages on the world's largest free online encyclopedia”4. This website contains two box and a result box to shows how the graph of connected articles. Picture of Six Degrees of Wikipedia Website connecting. The new Six Degrees of Wikipedia visualizes all the shortest paths between any two entries as a network map. You can drag the map around and click any point to go to the relevant Wikipedia page.

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The six degrees of freedom: forward/back, up/down, left/right, yaw, pitch, roll

Six degrees of freedom (6DoF) refers to the freedom of movement of a rigid body in three-dimensional space. Specifically, the body is free to change position as forward/backward (surge), up/down (heave), left/right (sway) translation in three perpendicularaxes, combined with changes in orientation through rotation about three perpendicular axes, often termed yaw (normal axis), pitch (transverse axis), and roll (longitudinal axis). Three degrees of freedom (3DOF), a term often used in the context of virtual reality, refers to tracking of rotational motion only: pitch, yaw, and roll.[1][2]


Serial and parallel manipulator systems are generally designed to position an end-effector with six degrees of freedom, consisting of three in translation and three in orientation. This provides a direct relationship between actuator positions and the configuration of the manipulator defined by its forward and inverse kinematics.

Robot arms are described by their degrees of freedom. This is a practical metric, in contrast to the abstract definition of degrees of freedom which measures the aggregate positioning capability of a system.[3]

In 2007, Dean Kamen, inventor of the Segway, unveiled a prototype robotic arm[4] with 14 degrees of freedom for DARPA. Humanoid robots typically have 30 or more degrees of freedom, with six degrees of freedom per arm, five or six in each leg, and several more in torso and neck.[5]


The term is important in mechanical systems, especially biomechanical systems for analyzing and measuring properties of these types of systems that need to account for all six degrees of freedom. Measurement of the six degrees of freedom is accomplished today through both AC and DC magnetic or electromagnetic fields in sensors that transmit positional and angular data to a processing unit. The data is made relevant through software that integrates the data based on the needs and programming of the users.

Mnemonics to remember angle names

The six degrees of freedom of a mobile unit are divided in two motional classes well as described below ;

Translational envelopes :

  1. Moving forward and backward on the X-axis. (Surge)
  2. Moving left and right on the Y-axis. (Sway)
  3. Moving up and down on the Z-axis. (Heave)

Rotational envelopes :

  1. Tilting side to side on the X-axis. (Roll)
  2. Tilting forward and backward on the Y-axis. (Pitch)
  3. Turning left and right on the Z-axis. (Yaw)

Operational envelope types[edit]

6 Degrees Of Wikipedia Game

There are three types of operational envelope in the Six degrees of freedom. These types are Direct, Semi-direct (conditional) and Non-direct, all regardless of the time remaining for the execution of the maneuver, the energy remaining to execute the maneuver and finally, if the motion is commanded via a biological entity (e.g. human), a robotical entity (e.g. computer) or both.

  1. Direct type: Involved a degree can be commanded directly without particularly conditions and described as a normal operation. (An aileron on a basic airplane)
  2. Semi-direct type: Involved a degree can be commanded when some specific conditions are met. (Reverse thrust on an aircraft)
  3. Non-direct type: Involved a degree when is achieved via the interaction with its environment and cannot be commanded. (Pitching motion of a vessel at sea)

Transitional type also exists in some vehicles. For example, when the Space Shuttle operates in space, the craft is described as fully-direct-six because its six degrees can be commanded. However, when the Space Shuttle is in the earth's atmosphere for its return, the fully-direct-six degrees are no longer applicable for many technical reasons.

Game controllers[edit]

Six degrees of freedom also refers to movement in video game-play.

First-person shooter (FPS) games generally provide five degrees of freedom: forwards/backwards, slide left/right, up/down (jump/crouch/lie), yaw (turn left/right), and pitch (look up/down). If the game allows leaning control, then some consider it a sixth DoF; however, this may not be completely accurate, as a lean is a limited partial rotation.

The term 6DoF has sometimes been used to describe games which allow freedom of movement, but do not necessarily meet the full 6DoF criteria. For example, Dead Space 2, and to a lesser extent, Homeworld and Zone Of The Enders allow freedom of movement.

Some examples of true 6DoF games, which allow independent control of all three movement axes and all three rotational axes, include Elite Dangerous, Shattered Horizon, the Descent franchise, Retrovirus, Miner Wars, Space Engineers, Forsaken and Overload (from the same creators of Descent). The space MMO Vendetta Online also features 6 degrees of freedom.

Motion tracking devices such as TrackIR are used for 6DoF head tracking. This device often finds its places in flight simulators and other vehicle simulators that require looking around the cockpit to locate enemies or simply avoiding accidents in-game.

The acronym 3DoF, meaning movement in the three dimensions but not rotation, is sometimes encountered.

The Razer Hydra, a motion controller for PC, tracks position and rotation of two wired nunchucks, providing six degrees of freedom on each hand.

The SpaceOrb 360 is a 6DOF computer input device released in 1996 originally manufactured and sold by the SpaceTec IMC company (first bought by Labtec, which itself was later bought by Logitech).

The controllers sold with HTC VIVE provide 6DOF information by the lighthouse, which adopts Time of Flight (TOF) technology to determine the position of controllers.

See also[edit]

  • Degrees of freedom (mechanics) – Number of independent parameters that define the configuration or state of a mechanical system.
  • Degrees of freedom problem – The multiple ways for multi-joint objects to realize a movement
  • Geometric terms of location – Directions or positions relative to the shape and position of an object
  • Ship motions – Terms connected to the 6 degrees of freedom of motion


  1. ^Batallé, Jordi (12 February 2013). 'An Introduction to Positional Tracking and Degrees of Freedom (DOF)'. Road to VR. Retrieved 20 October 2019.
  2. ^'Degrees of Freedom Google VR '. Google Developers. Retrieved 20 October 2019.
  3. ^Paul, Richard P., Robot Manipulators: Mathematics, Programming, and Control, MIT Press, 1981.
  4. ^'Luke, a new prosthetic arm for soldiers'. ted.com. 2007-03-01. Retrieved 2017-02-26.
  5. ^Craig, John J., Introduction to Robotics: Mechanics and Control, Addison-Wesley, 1986.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Six_degrees_of_freedom&oldid=1001638396'
Kevin Bacon with James Purefoy, who has a Bacon number of 2: Purefoy appeared in Women Talking Dirty with Helena Bonham Carter, and Bonham Carter appeared in Novocaine with Bacon. (Both actors were main cast on The Following, but television works are excluded from the game.)

Six Degrees of Kevin Bacon or Bacon's Law is a parlor game where players challenge each other to find the shortest path between an arbitrary actor and prolific actor Kevin Bacon, linked by films they have appeared in together. It rests on the assumption that anyone involved in the Hollywood film industry can be linked through their film roles to Bacon within six steps. The game's name is a reference to 'six degrees of separation', a concept which posits that any two people on Earth are six or fewer acquaintance links apart.

In 2007, Bacon started a charitable organization called SixDegrees.org. In 2020, Bacon started a podcast called The Last Degree of Kevin Bacon.[1]


In a January 1994 interview with Premiere magazine Kevin Bacon mentioned while discussing the film The River Wild that 'he had worked with everybody in Hollywood or someone who's worked with them.'[2] Following this, a lengthy newsgroup thread which was headed 'Kevin Bacon is the Center of the Universe' appeared.[3] Four Albright College students invented the game that became known as 'Six Degrees of Kevin Bacon'[2] after watching two movies featuring Bacon back to back, Footloose and The Air Up There. During the second they began to speculate on how many movies Bacon had been in and the number of people with whom he had worked.[citation needed]

They wrote a letter to talk show host Jon Stewart, telling him that 'Kevin Bacon was the center of the entertainment universe' and explaining the game.[4] They appeared on The Jon Stewart Show and The Howard Stern Show with Bacon to explain the game. Bacon admitted that he initially disliked the game because he believed it was ridiculing him, but he eventually came to enjoy it. The three inventors released a book, Six Degrees of Kevin Bacon (ISBN9780452278448), with an introduction written by Bacon.[4] A board game based on the concept was released by Endless Games.[citation needed]

In the summer of 2012, Google began to offer the ability to find an actor's Bacon number on its main page, by searching for the actor's name preceded by the phrase 'bacon number'.

In popular culture[edit]

In 1995 Cartoon Network referenced the concept in a commercial, having Velma (from Scooby-Doo) as the central figure in the 'Cartoon Network Universe'.[5] The commercial cites connections as arbitrary as fake appearances, sharing of clothes, or physical resemblance.

The concept was also presented in an episode of the TV show Mad About You dated November 19, 1996, in which a character expressed the opinion that every actor is only three degrees of separation from Kevin Bacon. Bacon spoofed the concept himself in a cameo he performed for the independent film We Married Margo.[6] Playing himself in a 2003 episode of Will and Grace, Bacon connects himself to Val Kilmer through Tom Cruise and jokes 'Hey, that was a short one!'.[7] The headline of The Onion, a satirical newspaper, on October 30, 2002, was 'Kevin Bacon Linked To Al-Qaeda'.[8] Bacon provides the voice-over commentary for the NY Skyride attraction at the Empire State Building in New York City. At several points throughout the commentary, Bacon alludes to his connections to Hollywood stars via other actors with whom he has worked.[citation needed]

Turner Classic Movies’ annual 31 Days of Oscar festival sometimes utilizes a promotional tactic called “360 Degrees of Oscar” (based on Bacon’s theoretical game) where TCM takes a significant actor, actress, director, or producer, and evolves its entire festival around them (the first and last films in the festival feature their works). It has been used as recently as 2020.

In 2009, Bacon narrated a National Geographic Channel show 'The Human Family Tree'[9] – a program which describes the efforts of that organization's Genographic Project to establish the genetic interconnectedness of all humans. Bacon appeared in a commercial for the Visacheck card that referenced the game. In the commercial, Bacon wants to write a check to buy a book, but the clerk asks for his ID, which he does not have. He leaves and returns with a group of people, then says to the clerk, 'Okay, I was in a movie with an extra, Eunice, whose hairdresser, Wayne, attended Sunday school with Father O'Neill, who plays racquetball with Dr. Sanjay, who recently removed the appendix of Kim, who dumped you sophomore year. So you see, we're practically brothers.'[10]

In 2011, James Franco made reference to Six Degrees of Kevin Bacon while hosting the 83rd Academy Awards.[how?]EE began a UK television advertising campaign on November 3, 2012, based on the Six Degrees concept, where Kevin Bacon illustrates his connections and draws attention to how the EE 4G network allows similar connectivity.[11]

In 'Weird Al' Yankovic's song 'Lame Claim to Fame,' one of the lines is, 'I know a guy who knows a guy who knows a guy who knows a guy who knows a guy who knows Kevin Bacon.'[12] American rapper MC Zappa also makes reference to the game in his 2018 song 'Level Up (The Ill Cypher)'.[13]

The most highly connected nodes of the Internet have been referred to as 'the Kevin Bacons of the Web', inasmuch as they enable most users to navigate to most sites in 19 clicks or less.[14][15]

Bacon numbers[edit]

The Bacon number of an actor is the number of degrees of separation he or she has from Bacon, as defined by the game. This is an application of the Erdős number concept to the Hollywood movie industry. The higher the Bacon number, the greater the separation from Kevin Bacon the actor is.

The computation of a Bacon number for actor X is a 'shortest path' algorithm, applied to the co-stardom network:

6 degrees of wikipedia game
  • Kevin Bacon himself has a Bacon number of 0.
  • Those actors who have worked directly with Kevin Bacon have a Bacon number of 1.
  • If the lowest Bacon number of any actor with whom X has appeared in any movie is N, X's Bacon number is N+1.


Elvis Presley:

  • Elvis Presley was in Change of Habit (1969) with Edward Asner
  • Edward Asner was in JFK (1991) with Kevin Bacon

Therefore, Asner has a Bacon number of 1, and Presley (who never appeared in a film with Bacon) has a Bacon number of 2.

Ian McKellen:

  • Ian McKellen was in X-Men: Days of Future Past (2014) with Michael Fassbender and James McAvoy
  • McAvoy and Fassbender were in X-Men: First Class (2011) with Kevin Bacon

Therefore, McAvoy and Fassbender have Bacon numbers of 1, and McKellen has a Bacon number of 2.

Because some people have both a finite Bacon and a finite Erdős number because of acting and publications, there are a rare few who have a finite Erdős–Bacon number, which is defined as the sum of a person's independent Erdős and Bacon numbers.

Center of the Hollywood Universe[edit]

While at the University of Virginia, Brett Tjaden created the Oracle of Bacon.[16] A previous version of this computer program used information on some 800,000 people from the Internet Movie Database (IMDb), while the current implementation uses data drawn from Wikipedia. The algorithm calculates 'how good a center'[17] an individual IMDb personality is, i.e. a weighted average of the degree of separation of all the people that link to that particular person. The site returns an average personality number, e.g. for Clint Eastwood, it returns an average 'Clint Eastwood Number.' From there the Oracle site posits 'The Center of the Hollywood Universe' as being the person with the lowest average personality number. Kevin Bacon, as it turns out, is not the 'Center of the Hollywood Universe' (i.e. the most linkable actor). In fact, Bacon does not even make the top 100 list of average personality numbers.[18] While he is not the most linkable actor, this still signifies being a better center than more than 99% of the people who have ever appeared in a film. Since each actor's average personality number can change with each new film made, the center can and does shift. 'Centers' have included Rod Steiger, Donald Sutherland, Eric Roberts, Dennis Hopper, Christopher Lee and Harvey Keitel.

A 2020 study from Cardiff University also used further measures to determine the center of the movie universe.[19] These included degree centrality, closeness centrality and betweenness centrality, which were implemented using the NetworkX Python Library. The study also looked at movies released in different decades and found that, between 2000 and 2020, the most central actors included Angelina Jolie, Brahmanandam, Samuel L. Jackson, and Ben Kingsley.

Photography book[edit]

Inspired by the game, the British photographer Andy Gotts tried to reach Kevin Bacon through photographic links instead of film links.

Gotts wrote to 300 actors asking to take their pictures, and received permission only from Joss Ackland. Ackland then suggested that Gotts photograph Greta Scacchi, with whom he had appeared in the film White Mischief. Gotts proceeded from there, asking each actor to refer him to one or more friends or colleagues. Eventually, Christian Slater referred him to Bacon. Gotts' photograph of Bacon completed the project, eight years after it began. Gotts published the photos in a book, Degrees (ISBN0-9546843-6-2), with text by Alan Bates, Pierce Brosnan, and Bacon.[20]

See also[edit]

  • Morphy Number, connections via chess games to Paul Morphy
  • Shusaku number, equivalent in the Go world with Honinbo Shusaku


  1. ^'Kevin Bacon's best friend definitely wants to murder him in exclusive trailer for his new podcast'. EW.com. Retrieved May 1, 2020.
  2. ^ abTeotonio, Isabel (September 13, 2012). 'Google adds Six Degrees of Kevin Bacon to search engine'. Toronto Star. Retrieved January 31, 2018.
  3. ^Ruthven, Alexander (April 7, 1994). 'Kevin Bacon is the Center of the Universe'. rec.arts.movies. Google groups. Retrieved July 19, 2009.
  4. ^ abFass, Craig; Turtle, Brian; Ginelli, Mike (1996). Six Degrees of Kevin Bacon. New York City: Plume. ISBN978-0-452-27844-8.
  5. ^Cartoon Network - March 1-13, 1995 Commercials, ID's & Interstitlals (Television production). Cartoon Network. March 1995. Retrieved December 21, 2020.
  6. ^'We Married Margo'. J.D. Shapiro's Official Website.
  7. ^Will and Grace, Season 5 episode 2 'Bacon and Eggs'
  8. ^'The Onion, Volume 38, Issue 40'. theonion.com. Retrieved May 26, 2013.
  9. ^'The Human Family Tree'. National Geographic Channel.
  10. ^'VISA CHECK CARD The Six Degrees Of Kevin Bacon'. YouTube. Retrieved September 4, 2017.
  11. ^'EE debuts multi-million pound marketing launch campaign starring Kevin Bacon'. The Lovemarks Company, Saatchi & Saatchi London. Retrieved November 5, 2012.
  12. ^'I know a guy who knows a guy who knows a guy who knows a guy / Who knows a guy who knows Kevin Bacon'. Genius.
  13. ^'Word; they be chasin' heaven like Jason Nevin / But there's more degrees of separation than Kevin Bacon'. Genius.
  14. ^Stromberg, Joseph (February 18, 2013). 'Any Two Pages on the Web Are Connected By 19 Clicks or Less'. Smithsonian. Retrieved March 22, 2013.
  15. ^Albert-László Barabási (February 18, 2013). 'Discussion: Network science'. Philosophical Transactions of the Royal Society. 371 (1987): 20120375. doi:10.1098/rsta.2012.0375. PMID23419844.
  16. ^'The Oracle of Bacon'. oracleofbacon.org.
  17. ^Reynolds, Patrick. 'How good a center an actor is?'. The Oracle of Bacon.
  18. ^Reynolds, Patrick. '1000 best centers'. The Oracle of Bacon.
  19. ^Lewis, R. 'Who is the Centre of the Movie Universe? Using Python and NetworkX to Analyse the Social Network of Movie Stars', arXiv:2002.11103, Feb 2020
  20. ^'Andy Gotts' Degrees Exhibition'. Clooney Studio. Archived from the original on October 13, 2007.

Longest 6 Degrees Of Wikipedia

External links[edit]

  • The Oracle of Bacon computes the Bacon number of any actor or actress from Wikipedia data
  • Six Degrees of Lois Weisberg by Malcolm Gladwell

6 Degrees Of Separation Wikipedia Game

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