High obliquity, high Angular Momentum Earth as Moon origin revisited by Advanced Kinematic Model of Earth-Moon System
Abstract
Matija Cuk et.al (2016) have proposed a new model for the birth and tidal evolution of our natural satellite Moon, born from impact generated terrestrial debris in the equatorial plane of high obliquity, high angular momentum Earth. This paper examines their findings critically in the light of advanced kinematic model (AKM) which includes Earth's obliquity (φ), Moon's orbital plane inclination (α) , Moon's obliquity (β) and lunar's orbit eccentricity (e). For the real Earth-Moon (E-M) system, the history of evolution of φ, α, β, e and (length of month)/(length of day) or LOM/LOD is traced from 45RE to 60.33RE where RE is Earth Radius. It is shown that AKM's valid range of application is from 45RE to 60.33RE . The evolution of α, β, e is in correspondence with the simulation results of Matija Cuk et.al (2016) but evolution of Earth's obliquity has a break at 45RE . According to AKM , earlier than 45RE Earth should achieve zero degree obliquity in order to achieve the modern value of 23.44 obliquity. Cuk et al (2016) do not explain how this can be achieved.AKM stands vindicated because using protocol exchange algorithm (described in S6 SOM), AKM has successfully given precise theoretical formalism of Observed LOD curve for the last 1.2Gy time span opening the way for early warning and forecasting methods for Earth-quake and sudden volcanic eruptions(See S7 of SOM).