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It is shown that an embedding of the general relativity $4-$space into a flat$12-$space gives a model of gravitation with the global $U(1)-$symmetry and thediscrete $D_{1}-$one. The last one may be transformed into the $SU(2)-$symmetryof the unified model, and the demand of independence of $U(1)-$ and$SU(2)-$transformations leads to the estimate $\sin^{2}\theta_{min}=0,20$ where$\theta_{min}$ is an analog of the Weinberg angle of the standard model.Comment: 7 page

Letter: A Model of Gravitation with Global U(1)-symmetry