 As this chronology was created completely separately from anything done for "Star Trek" after the "Original Series" (which at the time also avoided any hard date for when it happened), it cannot be reconciled directly with current "Star Trek" canon.As an example of the incompatibilities arising from the separate evolution of the two visions of "Star Trek" history, the SFU defines the "five-year mission" of the original "Star Trek" series as being from Y155 to Y160, which by Paramount's chronology would put Y0 at AD 2108; while if one accepts the definition of Y0, it should be the year of the movie "", AD 2063.While the time periods recorded in the Alpha Octant, Small Magellanic Cloud and Triangulum Galaxy are only loosely arranged into particular eras, the history of the Omega Octant is broken down into 'Cycles', as recorded by the Chlorophon race (who act as the de facto fictional historians of the Octant).