  The Earth's obliquity is stabilized by the Moon, which facilitates a rapid
precession of the Earth's spin-axis, de-tuning the system away from resonance
with orbital modulation. It is however, likely that the architecture of the
Solar System underwent a dynamical instability-driven transformation, where the
primordial configuration was more compact. Hence, the characteristic
frequencies associated with orbital perturbations were likely faster in the
past, potentially allowing for secular resonant encounters. In this work we
examine if at any point in the Earth's evolutionary history, the obliquity
varied significantly. Our calculations suggest that even though the orbital
perturbations were different, the system nevertheless avoided resonant
encounters throughout its evolution. This indicates that the Earth obtained its
current obliquity during the formation of the Moon.
