We report measurements of time‐dependentCPviolation in the neutralBmeson system using a data sample corresponding to 140 fb−1collected by the Belle detector at the KEKBe+e−collider. OneBmeson decaying into aCPeigenstate is fully reconstructed and the flavor of the accompanyingBmeson is identified by its decay products. TheCPviolation parameters are determined from the distribution of proper time intervals between the twoBdecays. Here, we cover a precise measurement of the Standard ModelCPviolation parameter sin(2&fgr;1), as well asCPasymmetry measurements in neutralBmeson decays intoJ/&psgr; &pgr;0and &pgr;+&pgr;−decays. © 2004 American Institute of Physics