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A giant impact origin for the Moon is generally accepted, but many aspects oflunar formation remain poorly understood and debated. \'Cuk et al. (2016)proposed that an impact that left the Earth-Moon system with high obliquity andangular momentum could explain the Moon's orbital inclination and isotopicsimilarity to Earth. In this scenario, instability during the Laplace Planetransition, when the Moon's orbit transitions from the gravitational influenceof Earth's figure to that of the Sun, would both lower the system's angularmomentum to its present-day value and generate the Moon's orbital inclination.Recently, Tian and Wisdom (2020) discovered new dynamical constraints on theLaplace Plane transition and concluded that the Earth-Moon system could nothave evolved from an initial state with high obliquity. Here we demonstratethat the Earth-Moon system with an initially high obliquity can evolve into thepresent state, and we identify a spin-orbit secular resonance as a keydynamical mechanism in the later stages of the Laplace Plane transition. Someof the simulations by Tian and Wisdom (2020) did not encounter this latesecular resonance, as their model suppressed obliquity tides and the resultinginclination damping. Our results demonstrate that a giant impact that leftEarth with high angular momentum and high obliquity ($\theta > 61^{\circ}$) isa promising scenario for explaining many properties of the Earth-Moon system,including its angular momentum and obliquity, the geochemistry of Earth and theMoon, and the lunar inclination.

Tidal Evolution of the Earth-Moon System with a High Initial Obliquity