1,820 = 13 × 140: The Trecena Drift Residual of the Dresden Eclipse Table as Structural Seed of the Paris Codex Zodiacal Period Two Structural Chains from the Uinal-Scale Decomposition of 405 = 14 × 28 + 13

The Maya canonical corpus contains two lunar canons: the 405-lunation Dresden Eclipse Table (Dresden Codex pp. 51a–58b) and the 1,447/49 computing-cycle canon identified by Lounsbury (1978). Both produce a canonical mean lunation within fractions of a thousandth of a day of the modern observed value, and both achieve this precision through canonical-corpus integer architecture rather than continuous-value approximation. This paper positions the lunar canons within the Maya canonical drift architecture established across the planetary canons (Mercury 117, Venus 584, Mars 780, Jupiter 399, Saturn 378) and develops seven structural findings for the Dresden Eclipse Table.