The Epoch-Corrected Identity Latitude During the African Humid Period: Precessional Drift of the Sirius-Standstill Resonance, 15,000 BCE to Present

The companion paper (Sennfelt 2026d) established that the identity relationship — φ + |δ_Sirius| = δ_standstill — holds uniquely at latitude 11.87°N in the current epoch, placing the identity latitude within the Afar Depression of Ethiopia. However, Sirius's declination changes substantially under precession: at 11,800 BCE it was approximately −54.6°, placing the identity latitude at approximately −24.6°S. This paper computes the position of the identity latitude from 15,000 BCE to the present at 500-year intervals and proposes a two-phase model: a Sadr-circumpolar founding phase (approximately 15,685–12,310 BCE) followed by an identity-latitude codification phase (approximately 4,500 BCE onward) as Sirius's declination drifted northward to bring the identity condition to bear at Afar latitudes.