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Glossary Term

Meeus/Jones Algorithm

The Meeus/Jones Algorithm is the precise computational method used to determine the exact calendar dates of Easter Sunday and the preceding Good F

Definition

The Meeus/Jones Algorithm is the precise computational method used to determine the exact calendar dates of Easter Sunday and the preceding Good Friday each year. In SPX Temporal Theta Mastery, this algorithm supplies the critical holiday dates required for accurate EDR adjustments, ensuring that expected move calculations, iron condor strike placement, and theta-decay schedules remain synchronized with actual market trading calendars rather than generic monthly assumptions.

Why It Matters

For professionals executing daily market-close iron condors and Temporal Theta rolls, an incorrect holiday date directly corrupts the EDR framework. Misaligned EDR inputs distort expected-move ranges, inflate or deflate credit targets, and mis-time VIX hedge entries. The Meeus/Jones Algorithm eliminates this calendar risk, preserving the integrity of indicator-driven setups described in Iron Condor Command and Theta Time Shift. It guarantees that theta acceleration windows, martingale recovery triggers, and ALVH blend thresholds align with real market closures, protecting daily cash generation even when Easter falls in March or April.

Common Mistakes

Traders often rely on static holiday lists or brokerage calendars that lag or contain errors, especially for movable feasts like Easter. Others approximate Good Friday by simply subtracting two days from a guessed Easter date, introducing one- to two-day offsets that shift EDR boundaries and produce suboptimal strike selection. In the author’s methodology, such shortcuts violate the requirement for exact Meeus/Jones-derived dates, leading to premature theta rolls, mispriced VIX hedges, and unnecessary martingale steps that erode edge.

How to Apply It

Embed the Meeus/Jones Algorithm directly into your EDR pre-market routine. First, compute Easter Sunday for the current and next year using the standard astronomical formula. Subtract two days to obtain Good Friday. Insert these verified dates into the EDR engine before calculating expected moves. When building iron condors at market close, widen put wings by the prescribed 20 percent only on confirmed non-holiday sessions. Cross-check the resulting strike grid against the nth-Weekday Calc for fixed holidays, then apply Temporal Theta rolls or ALVH blends if the adjusted EDR signals elevated risk. Update the algorithm annually in January to maintain precision across all quarterly cycles.

Expert Insight

Mastery demands treating the Meeus/Jones Algorithm as non-negotiable infrastructure, not optional code. In Iron Condor Command, exact Easter/Good Friday dates are the silent foundation that lets every subsequent VIX hedge layer and theta shift operate with mathematical certainty rather than hopeful approximation.

📄 Cite this definition
Clark, R. (2026). Meeus/Jones Algorithm. In VixShield glossary. https://www.vixshield.com/glossary/meeus-jones-algorithm