Extended Data Figure 9 : The Moon’s wobble as it approaches the annual resonance in Fig. 4.

From: Tidal evolution of the Moon from a high-obliquity, high-angular-momentum Earth

Extended Data Figure 9

The rotation rate around the longest axis of the Moon (a) and the angle between the longest axis and Earth (b) during the first phase of lunar tidal evolution (red points in Fig. 4) within 29.7RE, where we accelerated the tidal evolution by a factor of a hundred. The wobble is clearly building up as the Moon is approaching the resonance between its free wobble and Earth’s orbital period at about 29.7RE. The growth in lunar libration angle is more influenced by increasing lunar obliquity (Fig. 4b) than the increase in the amplitude of the wobble.