Polar cap shape for PSR B1929+10 assuming the RVM solution of the inclination angle α = 55° ​​.62 and the impact angle β = 53° ​​.47 under the two-pole model in rotating magnetosphere approximation. To compare the two magnetospheres in the static and rotating approximations, the polar cap shape of the static dipole is also included, and it is in the dashed black curve. To investigate the emission geometry of this pulsar, the magnetic pole with respect to the rotation axis in the inclination angle α is defined as Pole 1 and labeled with the black dot. Its opposite magnetic pole is defined as Pole 2 and indicated by the black cross. The ϕ and θ_r correspond to the azimuthal and zenith angles with respect to the rotation axis.