Question: Which person flew into space first, Ivan Bella or Sigmund Jähn?

Context articles: OSA-UCS
Ivan Bella
Stefan Walz
Ulf Merbold
Wally Schirra
Joseph M. Acaba
Eberhard Köllner
Sigmund Jähn
Soyuz TM-29
Tonnetz

In colorimetry the OSA-UCS (Optical Society of America Uniform Color Space) is a color space first published in 1947 and developed by the Optical Society of America’s Committee on Uniform Color Scales.
 Previously created color order systems, such as the Munsell color system, failed to represent perceptual uniformity in all directions.
 The committee decided that, in order to accurately represent uniform color differences in each direction, a new shape of three dimensional cartesian geometry would need to be used.
Ivan Bella (born 25 May 1964 in Brezno, Czechoslovakia (now Slovakia)) is a Slovak Air Force officer who became the first Slovak citizen to fly in space.
 He participated in an eight-day joint Russian-French-Slovak mission to the Mir space station in 1999.
Stefan Walz (born 1963) is a Swiss actor.
 His best known role is as Sigmund Jähn in the film "Good Bye, Lenin!
".
Dr. Ulf Dietrich Merbold (born June 20, 1941) is the first West German citizen and second German native (after Sigmund Jähn) to have flown in space.
 He is also the first member of the European Space Agency Astronaut Corps to participate in a spaceflight mission and the first non-US citizen to reach orbit in a US spacecraft.
 In 1983, he and Byron Lichtenberg became the first Payload Specialists to fly on the shuttle.
Walter Marty "Wally" Schirra Jr. (March 12, 1923 – May 3, 2007), (CAPT, USN), was an American naval officer and aviator, aeronautical engineer, test pilot, and one of the original seven astronauts chosen for Project Mercury, United States first effort to put humans in space.
 He flew the six-orbit, nine-hour Mercury-Atlas 8 mission on October 3, 1962, becoming the fifth American, and the ninth human, to ride a rocket into space.
 In the two-man Gemini program, he achieved the first space rendezvous, station-keeping his Gemini 6A spacecraft within 1 ft of the sister Gemini 7 spacecraft in December 1965.
 In October 1968, he commanded Apollo 7, an 11-day low Earth orbit shakedown test of the three-man Apollo Command/Service Module.
 He was the first person to go into space three times, and the only person to have flown in Mercury, Gemini, and Apollo, logging a total of 295 hours and 15 minutes in space.
 He retired from the U.S. Navy at the rank of Captain and from NASA after his Apollo flight, becoming a consultant to CBS News for its coverage of the subsequent Apollo flights.
 He joined Walter Cronkite as co-anchor for the seven Moon landing missions.
Joseph Michael "Joe" Acaba (born May 17, 1967) is an educator, hydrogeologist, and NASA astronaut.
 In May 2004 he became the first person of Puerto Rican heritage to be named as a NASA astronaut candidate, when he was selected as a member of NASA Astronaut Training Group 19.
 He completed his training on February 10, 2006 and was assigned to STS-119, which flew from March 15 to March 28, 2009 to deliver the final set of solar arrays to the International Space Station.
 Acaba served as a Flight Engineer aboard the International Space Station, having launched on May 15, 2012.
 He arrived at the space station on May 17 and returned to Earth on September 17, 2012 at 6:53am Moscow Standard Time when touchdown was officially recorded by the Russian Federal Space Agency.
 Acaba returned to the International Space Station in 2017 as a member of Expedition 53/54.
Eberhard Köllner (born 29 September 1939 in Stassfurt, Germany) was selected for Soyuz 31 as the backup for Sigmund Jähn.
Sigmund Werner Paul Jähn (born 13 February 1937) is a German cosmonaut and pilot, who in 1978 became the first East German (and German native) to fly in space as part of the Soviet Union's Interkosmos programme.
Soyuz TM-29 was a Russian manned spacecraft launched from the Baikonur Cosmodrome aboard a Soyuz 11A511U rocket.
 It docked with Mir on February 22 at 05:36 GMT with Cosmonauts Viktor Afanasyev of Russia, Jean-Pierre Haigneré of France, and Ivan Bella of Slovakia aboard.
 Since two crew seats had been sold (to Slovakia and France), Afanasyev was the only Russian cosmonaut aboard.
 This meant that Russian engineer Avdeyev already aboard Mir would have to accept a double-length assignment.
 After the February 27 departure of EO-26 crew commander Padalka and cosmonaut Bella aboard Soyuz TM-28, the new EO-27 Mir crew consisted of Afanasyev as Commander, Avdeyev as Engineer and French cosmonaut Haigneré.
In musical tuning and harmony, the Tonnetz (German: "tone-network" ) is a conceptual lattice diagram representing tonal space first described by Leonhard Euler in 1739.
 Various visual representations of the "Tonnetz" can be used to show traditional harmonic relationships in European classical music.