Here I explore a modified biblical model for the Earth's axial obliquity with the great deluge occurring around 3154 ± 191 BC. A sinusoidal oscillation is proposed to account for small deviations in the model. 30 additional Nautical Almanac data are also added.

The rotational axis of Earth is tilted at an angle of 23.44 degrees to the plane of the planet's orbit around the Sun. How has it changed over the past 7,000 years? Is there evidence of an extraordinary event that changed it?