Formula_9503

\[\begin{gathered}R^{x}(t)=\rho(t) \sin \Theta(t) \cos \varphi(t), \\R^{y}(t)=\rho(t) \sin \Theta(t) \sin \varphi(t), \\R^{z}(t)=-\rho(t) \cos \Theta(t) .\end{gathered}\]