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We make publicly available an efficient, versatile, easy to use and extendtool for calculating the evolution of circular aligned planetary orbits due tothe tidal dissipation in the host star. This is the first model to fullyaccount for the evolution of the angular momentum of the stellar convectiveenvelope by the tidal coupling, the transfer of angular momentum between thestellar convective and radiative zones, the effects of the stellar evolution onthe tidal dissipation efficiency and stellar core and envelope spins, the lossof stellar convective zone angular momentum to a magnetically launched wind andfrequency dependent tidal dissipation. This is only a first release and furtherdevelopment is under way to allow calculating the evolution of inclined andeccentric orbits, with the latter including the tidal dissipation in the planetand its feedback on planetary structure. Considerable effort has been devotedto providing extensive documentation detailing both the usage and the completeimplementation details, in order to make it as easy as possible for independentgroups to use and/or extend the code for their purposes. POET represents asignificant improvement over some previous models for planetary tidal evolutionand so has many astrophysical applications. In this article, we describe andillustrate several key examples.

POET: A Model for (P)lanetary (O)rbital (E)volution due to (T)ides on Evolving Stars