<p>In this paper, we study the Dirichlet problem for Laplace’s equation in an open disk. The uniqueness of solutions is ensured by the well-known weak maximum principle. We introduce a novel approach to demonstrate the existence of a solution using harmonic polynomials that converge uniformly to a solution. Specifically, we rigorously derive the convergence rate of the harmonic polynomials and show that smoother boundary data and proximity of the target point to the disk’s center accelerate the convergence. Additionally, we obtain uniform estimates for the derivatives of solutions of arbitrary orders, controlled by <i>L</i>¹-boundary data. Notably, the constants in our estimates are significantly improved compared to the existing results. Furthermore, we provide a refined convergence region for Taylor’s series of the solution, along with error estimates within this region, at each point in the open disk.</p>