Timeline of events that occurred prior to the First Season

[The Proton Resurgence, The Proton Displacement]
January 17, 1931 James Earl Jones born [The Convention Conundrum]

January 31, 1941 Mrs. Latham born [The Benefactor Factor]

February 20, 1945 George Smoot born [The Terminator Decoupling]

August 30, 1948   Dr. Crawley, later an etymologist born [The Jiminy Conjecture]
February 2, 1949 Brent Spiner born [The Russian Rocket Reaction]

August 8, 1949 Wyatt, Penny’s dad is born [The Boyfriend Complexity]

August 11, 1950 Steve Wozniak born [The Cruciferous Vegetable Amplification]

June 5, 1951 Dr. Eric Gablehouser born

February 2, 1952 Mrs. Wolowitz, Howard’s mother born



May 2, 1952   Dr. Beverly Hofstader born

July 1, 1952 Dr. V.M. Koothrappali born

January 14, 1954 Althea, a nurse born [The Werewolf Transformation and

                              The Robotic Manipulation]

May 16, 1954 Angelo, the nephew of Sheldon’s barber born [The Werewolf

                         Transformation]

June 16, 1955 Mary Cooper born

<p class="MsoNormal">November 27, 1955 Bill Nye born [The Proton Displacement]

<p class="MsoNormal">November 29, 1955 Howie Mandel born [The Re-Entry Minimization]

<p class="MsoNormal">July 6, 1956 Mike Rostenkowski born

<p class="MsoNormal">October 21, 1956 Carrie Fisher born [The Convention Conundrum]

<p class="MsoNormal">February 16, 1957 LeVar Burton born [The Toast Derivation, The Habitation

<p class="MsoNormal">                                Configuration]

<p class="MsoNormal">October 5, 1958 Neil de Grasse Tyson born [The Apology Insufficiency]

<p class="MsoNormal">August 19, 1962 Mike Massimo born [The Friendship Contraction]

<p class="MsoNormal">July 3, 1964 Sandy future CA employment services worker born [The Einstein

<p class="MsoNormal">                      Approximation]

<p class="MsoNormal">September 3, 1965 Charlie Sheen born [The Griffin Equivalency]

<p class="MsoNormal">January 17, 1966 President Seibert born [The Benefactor Factor]

<p class="MsoNormal">July 6, 1966 Bert, who likes Amy born [The Occupation Recalibration]

<p class="MsoNormal">February 16, 1967 Cosmonaut Dimitri Rezinov born [The Countdown Reflection]

<p class="MsoNormal">July 24, 1969 Glenn Bernadette’s former professor & boyfriend born [The Love Car

<p class="MsoNormal">                         Displacement]

<p class="MsoNormal">June 22, 1970 Dr. David Underhill born [The Bath Item Gift Hypothesis]

<p class="MsoNormal">December 4, 1970 Stuart Bloom, later a comic book store owner born

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<p class="MsoNormal">January 15, 1971 Janine Davis, later Cal Tech’s Human Resource Manager born

<p class="MsoNormal">

<p class="MsoNormal">May 30, 1971 Barry Kripke, later a professor at Cal Tech born

<p class="MsoNormal">

<p class="MsoNormal">July 29, 1972 Wil Wheaton born

<p class="MsoNormal">February, 1972 to February, 1973    Leonard’s sister born [The Cohabitation Formulation]

<p class="MsoNormal">1974 Stephen Hawking records a lecture at MIT [Pilot]

<p class="MsoNormal">September 18, 1974 Eric, who dated Penny born [The Codpiece Topology]

<p class="MsoNormal">January 3, 1975 Abby, who dates Raj born [The Psychic Vortex]

<p class="MsoNormal">January 29, 1975 Dr. Leslie Winkle born

<p class="MsoNormal">July 20, 1975 Dr. Elizabeth Plimpton born [The Plimpton Stimulation]

<p class="MsoNormal">May 13, 1977 Zack Johnson born

<p class="MsoNormal" style="tab-stops:385.0pt">September 24, 1977 Dr. Catherine Millstone born [The Pirate Solution]

<p class="MsoNormal" style="tab-stops:385.0pt">November, 1977 to November 1978 the Rostenkowskis get married [The Thanksgiving

<p class="MsoNormal" style="tab-stops:385.0pt">                                                             Decoupling]

<p class="MsoNormal" style="tab-stops:385.0pt">March 3, 1978 Priya Koothrapalli born

<p class="MsoNormal" style="tab-stops:385.0pt">June 10, 1978 Toby Loobenfeld, who impersonates Sheldon’s cousin Leo born

<p class="MsoNormal" style="tab-stops:385.0pt">                         [The Loobenfeld Decay]

<p class="MsoNormal" style="tab-stops:385.0pt">June 27, 1978 Alice, who later dates Leonard born [The Good Guy Fluctuation]

<p class="MsoNormal" style="tab-stops:385.0pt">

<p class="MsoNormal">January 26, 1979 Dr. Stephanie Barnett born [The Lizard-Spock Expansion, The White

<p class="MsoNormal">                              Asparagus Triangulation, The Vartabedian Conundrum]

<p class="MsoNormal">March 5, 1979 Ramona Nowitzki born [The Cooper-Nowitzki Theorem]

<p class="MsoNormal">March 31, 1980 Lucy, who later dates Raj is born

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<p class="MsoNormal">May 17, 1980 Leonard Hofstadter born [The Alien Parasite Hypothesis (12 years after

<p class="MsoNormal">                           High school] [The Peanut Reaction]

<p class="MsoNormal">June 23, 1980 Bernadette Rostenkowski born

<p class="MsoNormal">November 25, 1980 Alicia born [The Dead Hooker Juxtaposition]

<p class="MsoNormal">December 30, 1980 future FBI agent Page born [The Apology Insufficiency]

<p class="MsoNormal">March 14, 1981 Cole, who is in Penny’s history class born [The 43 Peculiarity]

<p class="MsoNormal">April 21 – May 21, 1981 Sheldon Cooper born

<p class="MsoNormal">July 24, 1981 Summer Glau born [The Terminator Decoupling]

<p class="MsoNormal">February 17, 1982 Christy Vanderbel   is born [The Dumpling Paradox]

<p class="MsoNormal">April, 1981 to December, 1981    Howard Wolowitz is born[The Pancake Batter Anomaly

<p class="MsoNormal">                                                      [The Recombination Hypothesis]

<p class="MsoNormal">August 24, 1984 Kevin who liked Penny born [The Ornithophobia Diffusion ]

<p class="MsoNormal">April, 1985 – May, 1986 Sheldon’s mother tells him he can’t point out to people that they

<p class="MsoNormal">                                           are not as smart as him [The Luminous Fish Effect]

<p class="MsoNormal">November 30,   1985 Penny born [The Barbarian Sublimation, The Prestidigitation

<p class="MsoNormal">                                   Approximation]

<p class="MsoNormal">March 4, 1986 Alex Jensen, later Dr. Sheldon Cooper’s graduate assistant born

<p class="MsoNormal" style="tab-stops:385.0pt">April, 1986 –May 1987 Sheldon starts carrying “Justice League of America” membership

<p class="MsoNormal" style="tab-stops:385.0pt">                                         card in his wallet   [The grasshopper Experiment], Billy

<p class="MsoNormal" style="tab-stops:385.0pt">                                          Sparks shoves a Mexican peso up his nose [Shiny Trinket

<p class="MsoNormal" style="tab-stops:385.0pt">                                          Manuever] and his PopPop dies [The Santa Simulation]

<p class="MsoNormal" style="tab-stops:385.0pt">October 31, 1986 Howard has first anacephahtic shock [The Habitation Configuration]

<p class="MsoNormal">November 6, 1986 Emily, who dated Raj born [The Wiggly Finger Catalyst]

<p class="MsoNormal">November 10, 1986 Jesse, Stuart’s rival born [The Occupation Recalibration]

<p class="MsoNormal">December, 1986 Sheldon asks the Baybrook Mall Santa to bring his Pop Pop back [The

<p class="MsoNormal">                             Santa Simulation]

<p class="MsoNormal">October 31, 1987 Sheldon dresses as Stephen Hawking for Halloween [The Hawking

<p class="MsoNormal">                               Excitation]

<p class="MsoNormal">March 22, 1988   Yvette, later a vet born [The Locomotive Manipulation]

<p class="MsoNormal">April, 1988 – May, 1989 Sheldon chased up tree by chicken [The Ornithophobia

<p class="MsoNormal">                                           Diffusion] =                       = <p class="MsoNormal">November 9, 1988   Annleigh Tipton born [The Panty Piñata Polarization]

<p class="MsoNormal">1989 Sheldon starts his enemy list [The Russian Rocket Reaction]

<p class="MsoNormal">March, 1989 Sheldon tries and fails to do a chin-up [The Thespian Catalyst]

<p class="MsoNormal">April, 1989 – May 1990 Sheldon tries to convert Missy’s ez Bake oven into a nuclear

<p class="MsoNormal">                                          furnace [The Pork Chop Indeterminancy]

<p class="MsoNormal">January 20, 1990 Samantha Potter born [The Panty Piñata Polarization]

<p class="MsoNormal">April, 1991 and May, 1992 Sheldon writes “Where no Sheldon has gone before”

<p class="MsoNormal">                                              [The Thespian Catalyst], Missy gets her father “A World’s

<p class="MsoNormal">                                               Greatest Dad” coffee mug [The Griffin Equivalency]

<p class="MsoNormal">Between Sept. 91 and May 92 Penny & Rosie make pact to marry Bert & Ernie

<p class="MsoNormal">                                                     [The Creepy Candy Coating Corollary]

<p class="MsoNormal">April 1992 to February 1993 Howard’s father leaves [The Precious Fragmentation] & he

<p class="MsoNormal">                                                 has a karate lesson [The Alien Parasite Hypothesis]

<p class="MsoNormal">May, 1992 to May, 1993 Sheldon sends bag of excrement to FBI crime lab [The Apology

<p class="MsoNormal">                                          Insufficiency]

<p class="MsoNormal">September, 1992 Sheldon starts college [The Hamburger Postulate]

<p class="MsoNormal">April, 1992 to March, 1993 Dennis Kim born [The Jerusalem Duality]

<p class="MsoNormal">April – May, 1993 for 12th b-day S gets motorized dirt bike instead of titanium centrifuge

<p class="MsoNormal">                                [The Peanut Reaction]

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<p class="MsoNormal">April, 1993 to May, 1994 while 12 Sheldon conducts staircase experiments [Pilot]

<p class="MsoNormal">                                 magpie tries to steal Sheldon’s retainer [The Ornithophobia Diffusion]

<p class="MsoNormal">April, 1994 to May, 1995 Sheldon tries to build nuclear reactor & death ray [The

<p class="MsoNormal">                                            Luminous fish effect]

<p class="MsoNormal">April 21, 1995 to May 21, 1996 Sheldon’s father dies [The Thanksgiving Decoupling]

<p class="MsoNormal">May, 1995 Sheldon graduates sum cum laude from college as valedictorian

<p class="MsoNormal">                    [The Pants Alternative]

<p class="MsoNormal">November 1995 Sheldon wins Stevenson award [The Jerusalem Duality]

<p class="MsoNormal">1995 Sheldon attend Dixie Trek IV [The Creepy Candy Coating Corollary]

<p class="MsoNormal">September, 1996 Sheldon starts year as guest lecturer at the Heidelberg Institute

<p class="MsoNormal">                              [The Pancake Batter Anomaly] & Howard meets Denise Palmari [The

<p class="MsoNormal">                              Jerusalem Duality]

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<p class="MsoNormal">April, 1996 Penny’s nephew born [The Hofstader Isotope]

<p class="MsoNormal">April, 1997 – May, 1998 parrot calls Sheldon fatass [The Ornithophobia Diffusion ]

<p class="MsoNormal">1999 Sheldon has pernicious anemia [The Codpiece Topology]

<p class="MsoNormal">April, 1999 Sheldon starts on thesis [The Luminous Fish Effect]

<p class="MsoNormal">April, 1998 to December, 1999 Howard’s mom removes bed rail [The Countdown

<p class="MsoNormal">                                                     Reflection]

<p class="MsoNormal">May, 1999 and May 2000 Sheldon moves into apartment [The Dumpling Paradox]

<p class="MsoNormal">                                             and Amy’s cousin Irene and family die in a CO accident [The

<p class="MsoNormal">                                             Isolation Permutation]

<p class="MsoNormal">April, 2000 to May, 2001 Sheldon has full pubis [The Habitation configuration]

<p class="MsoNormal">October - December 2002 Leonard moves in [The 21 Second Excitation, The Staircase

<p class="MsoNormal">                                             Implementation]

<p class="MsoNormal">December 12, 2002 Leonard & Sheldon stand in line 14 hours to see Star Trek: Nemesis

<p class="MsoNormal">                                  [The 21 Second Excitation]

<p class="MsoNormal">April, 2003 Sheldon finishes thesis, becomes PhD starts work at   Cal Tech

<p class="MsoNormal">                     [The Luminous Fish Effect]

<p class="MsoNormal">May, 2003 Sheldon goes on cruise to the Arctic to see solar eclipse [The Hamburger

<p class="MsoNormal">                    Postulate], while Leonard dates a French PhD in French literature

<p class="MsoNormal">February, 2003 to February 2004 Penny starts living with Kurt [Pilot]

<p class="MsoNormal">May, 2003 to May, 2004 Raj meets Howard [The Apology Insufficiency]

<p class="MsoNormal">June 30, 2004 at opening of Spiderman 2 Leonard & Howard make girlfriend pack

<p class="MsoNormal">                         [The Creepy Candy Coating Corollary]

<p class="MsoNormal">April 12, 2005 Leonard & Howard make pinkie swear not to hit on Priya [The Irish

<p class="MsoNormal">                           Pub Formulation}

<p class="MsoNormal" style="tab-stops:281.0pt">April, 2006 to April, 2007 Penny and Kurt move to LA [The Barbarian Sublimation]

<p class="MsoNormal" style="tab-stops:281.0pt">

<p class="MsoNormal" style="margin-left:30.25pt;text-indent:-30.25pt;mso-list: l3 level1 lfo4;tab-stops:list 48.0pt left 281.0pt">2006                 Sheldon has an ear infection [The Pancake Batter Anomaly] and Penny appears

<p class="MsoNormal" style="tab-stops:281.0pt">                  topless in Serial Apeist, a low budget horror film [The Hofstadter

<p class="MsoNormal" style="tab-stops:281.0pt">                  Insufficiency]

<p class="MsoNormal" style="tab-stops:281.0pt">November 23, 2006 Leonard’s alzheimic grandmother has an episode and removes her

<p class="MsoNormal" style="tab-stops:281.0pt">                                  clothing on Thanksgiving [Pilot]

<p class="MsoNormal" style="tab-stops:281.0pt">July, 2007   Raj has an encounter with Richard at Comic-Con and Leonard meets a girl

<p class="MsoNormal" style="tab-stops:281.0pt">                    there    [The Codpiece Topology]

<p class="MsoNormal" style="tab-stops:281.0pt">August 28, 2007   Leonard, Sheldon, Howard & Raj play Klingon boggle [Pilot]

Section heading
It is assumed that is a charater's birthdate has not been given they have the same birthdate as the actor who plays them. If some one says something happened six years ago they actually mean anywhere between 5 and a half and six and a half years ago. .