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According to the widely accepted notion, the Schr{\"o}dinger equation (SE) isnot derivable in principle. Contrary to this belief, we present here astraightforward derivation of SE. It is based on only two fundamentals ofmechanics: the classical Hamilton-Jacobi equation(HJE) and the Planck postulateabout the discrete transfer of energy at micro-scales. Our approach isdrastically different from the other published derivations of SE which eitheremploy an ad hoc underlying assumption about the probabilistic or thestatistical nature of the micro-scale phenomena, or rely on the prior knowledgeof SE and arrive at it by introducing a new postulate - neither present inclassical mechanics nor following from experiments - with a suitable butphysically unjustifiable choice of a key arbitrary constant.

Straightforward Derivation of the Schr{\"o}dinger Equation from Classical Mechanics and the Planck Postulate