Tidally dissipated power (𝒫_diss) as a function of the planet’s spin rotation period (horizontal axis) and obliquity (vertical axis) for Earth-sized dry (left panels) and global-ocean (right panels) planets. Top: full calculation of the planet’s tidal response (FULL). Middle: calculation using, for all tidal forcing terms, the degree-2 Love number computed in the equatorial plane assuming the coplanar-circular configuration (APPROX). Bottom: relative difference between the FULL and APPROX cases, defined by Eq. (93). The tidally dissipated power was computed from the tidal power and torque using Eq. (81). The dashed green lines indicate the resonances associated with the oceanic surface gravity modes (see Eq. (95) and Table 2), and the dashed magenta lines the 1:1 and 2:1 spin-orbit resonances. The black dot at (P_rot, β) = (1 day, 0°) designates the actual Earth-Moon system in the coplanar-circular approximation.