The Maya Calendar Accuracy, the 13th Baktun, and the C7 Venus Reset Model
A Corrected Explanation of 365.2420, Page 24, and the Post-Baktun Bird Marker
The Maya Calendar Accuracy: A Corrected Explanation
1. The Foundation
The Maya calendar system is strongly tied to the Venus synodic period, approximately 583.920 days. Venus was one of the most important astronomical anchors in the Maya system. The Dresden Codex Venus Table shows that Maya astronomers tracked Venus with exceptional care and used it as a long-range predictive and ritual framework.
The corrected model in this article separates two different things that are often mixed together:
- The prediction table: the written Dresden Venus Table, which forecasts future Venus positions and can require correction.
- The sky reset: the observed heliacal rise of Venus, which can re-anchor the living cycle to the real sky.
- The post-13th-Baktun marker: the tired or collapsed bird on Page 24, interpreted here as a visual marker of a post-cycle event.
This distinction is the center of the C7 accuracy model. A table can drift as a prediction. A real sky observation can reset the working cycle. A visual marker can identify where the page signals a transition or drop. These are not the same mechanism.
Historical clarification: The value 365.2420 days is not introduced here as my personal discovery. It belongs to an older line of Maya astronomy debate, especially the early twentieth-century work of John E. Teeple. Teeple argued that the Maya reached a tropical-year value near 365.2420 days, but his specific proof has been criticized, especially by Yasugi Yoshiho.
This article does not claim that 365.2420 is newly discovered here. It also does not defend the value through a direct Venus-only synodic equation. That equation gives the Earth sidereal orbital relation. The tropical-year value belongs to the solar-seasonal layer.
The new contribution here is the C7 accuracy model: C7 separates a predictive table from an observed sky reset. It also identifies the tired or collapsed bird as the visual marker in the post-13th-Baktun reading of Page 24. The Dresden Venus Table can require correction because it is a prediction table. But the observed heliacal rise of Venus can re-anchor the working cycle because the sky event overrides the arithmetic prediction.
2. The Post-13th-Baktun Bird Marker
The key point
The tired bird is not treated here as an isolated bird image. In the C7 reading, it matters because it appears after the completion of the 13th Baktun. Under the common GMT correlation, 13.0.0.0.0 corresponds to December 21, 2012. The C7 interpretation treats the tired or collapsed bird as a post-13th-Baktun visual marker.
This changes the meaning of the figure. The bird is not being used here as a general animal symbol. It is being read as a visual sign of exhaustion, descent, or collapse after a major cycle completion. That is why it functions as the entropy-drop marker in the C7 proof chain.
The logic is simple:
This is the missing bridge. The bird matters because of its visual posture and because of its placement in the post-13th-Baktun interpretive sequence. The position gives the symbol weight. The posture gives it meaning. The nearby numeral 8 and 10 Ajaw provide timing and calendrical context. The Venus Table preface provides the astronomical frame.
3. The Marked Page 24 Exhibit
The C7 proof should be checked visually against the marked Page 24 exhibit. The marked image uses three markers:
The tired/collapsed bird is the visual entropy-drop marker. The numeral 8 is the timing key. 10 Ajaw provides the calendrical anchor. Page 24 is the Venus Table preface, supplying the astronomical frame. The Ceasar7 equation yields the July 17, 2025 entropy-drop window.
How to verify: Anyone can compare the marked exhibit above to the original public facsimile of Dresden Page 24 (available via SLUB Dresden or FAMSI). The red circle marks the tired bird. The blue circle marks the numeral 8 (three dots + one bar). The green circle marks the 10 Ajaw date. The visual elements are present on the original page, not added by the marker.
4. The Venus Orbital Relation
The relationship between Venus and Earth is governed by celestial mechanics, expressed by the synodic period formula:
Where:
S = observed Venus synodic period, approximately 583.920 days
P_V = Venus sidereal orbital period, approximately 224.701 days
P_E = Earth sidereal orbital period from the Venus-Earth geometry
This formula is real and important. But it does not directly produce the tropical-year value of 365.2420 days. When the Venus sidereal period and Venus synodic period are inserted into the synodic equation, the result is the Earth sidereal orbital period, approximately 365.257 days.
Correction to the earlier claim: The Venus synodic equation shows the Earth-Venus orbital structure, but it does not by itself derive the tropical year of 365.2420 days. The 365.2420 value requires a solar-seasonal layer because the tropical year is measured against the return of the seasons, not against the fixed stars.
5. The Corrected 365.2420 Claim
The strongest claim is not that two Venus numbers alone produce 365.2420. The stronger claim is that the Maya had access to a layered observational system:
- Venus tracking: the 583.920-day Venus synodic return
- Solar tracking: seasonal horizon observations and the 365-day Haab'
- Long Count tracking: long-duration day totals over centuries
- Table correction: periodic adjustment of predictive Venus tables
- Sky reset: observed Venus return overriding the prediction table
- Post-Baktun visual marking: the tired bird as a C7 entropy-drop marker after the 13th Baktun completion
Under this corrected model, 365.2420 is not derived from Venus alone. It is a historical solar-seasonal value associated with the older Teeple-era debate. C7 does not claim ownership of that number. C7 uses it as a reference point for testing a different question: whether Maya accuracy should be measured as blind linear drift or as a reset-regulated observational system.
365.2420 → historical Teeple-era tropical-year claim
13th Baktun → major cycle completion at 13.0.0.0.0
Tired bird → post-13th-Baktun visual entropy-drop marker
Numeral 8 → timing key
10 Ajaw → calendrical anchor
Venus synodic return → external reset anchor
C7 → reset accuracy model separating table correction from sky reset
6. The Historical 365.2420 Value
The 365.2420-day value should be treated as a historical Maya astronomy claim, not as a new C7 calculation. Teeple's work made the value famous in early Maya astronomy studies. Later criticism challenged Teeple's method, especially the evidence used to support the value.
C7 does not need to defend Teeple's exact proof. C7 uses the 365.2420 number as a historical reference point, then asks a different question:
This reframes the problem. The C7 contribution is not the old number. The C7 contribution is the accuracy framework and the Page 24 proof chain.
7. The C7 Date Calculation
The C7 date claim is separate from the Teeple-era 365.2420 debate. The C7 date is produced through the Ceasar7 entropy equation:
In the C7 reading, the model begins from July 11, 2025. The entropy value then decays forward. The relevant drop window occurs on July 17, 2025.
If the decay constant or starting calibration is adjusted within the C7 spreadsheet, the reported drop value can be expressed near the lower collapse band, including the earlier working value near 42.3. The important point for this article is not the exact display value. The important point is the date window: July 17, 2025.
C7 date claim: The tired bird is the post-13th-Baktun visual marker. The numeral 8 is the timing key. 10 Ajaw is the calendrical anchor. The Venus Table preface supplies the astronomical frame. The C7 equation supplies the July 17, 2025 entropy-drop window.
8. The 5:8 Resonance Lock
Venus and Earth display a near-resonant relationship:
Using the Venus synodic cycle and the historical tropical-year value:
This small discrepancy is not meaningless. It is the drift signal between the Venus cycle and the seasonal year. It shows why a prediction table must eventually be updated. It also shows why direct observation matters. The table predicts; the sky verifies.
The 5:8 resonance is therefore a checksum, not a complete derivation. It helps compare Venus cycles and Earth-year cycles, but it does not prove that the tropical year came from Venus alone.
9. Long-Term Calibration
The Maya Long Count records total elapsed days from a fixed epoch. This makes it possible to compare Venus cycles, Haab' years, Tzolk'in cycles, lunar counts, and seasonal returns over long intervals.
Over a 104-year Venus Round:
This is the familiar reason that a predictive Venus table cannot run forever without updates. The table uses a rounded 584-day structure, while the real Venus synodic period is approximately 583.920 days.
Over longer spans, this prediction-table error accumulates. That does not mean the sky clock itself is drifting. It means the written predictive model must be periodically brought back into agreement with the observed sky.
10. Table Correction Versus Sky Reset
The Dresden Venus Table may need correction as a predictive document. But the operational sky clock can reset when Venus is physically observed. Table correction and sky reset are not the same mechanism.
The table is arithmetic. The sky is observational. A table can drift because it predicts future events using rounded intervals. But the observed heliacal rise of Venus can reset the working count because the real planet overrides the prediction.
- The table: a predictive guide that can accumulate error over many cycles.
- The clock: the observed Venus return at the horizon.
- The reset: the moment Venus appears, the new cycle begins from the observed event.
- The marker: the tired bird marks the post-13th-Baktun drop in the C7 reading.
11. Why the Venus Reset Matters
The Maya did not need to treat the Venus table like a European leap-year calendar. A leap-year system lets an arithmetic calendar drift, then adds a correction. The Venus reset model is different. It does not merely correct the count after drift. It re-anchors the cycle to the observed sky event.
That is the rubber band effect. The prediction may stretch away from the true sky. Then Venus appears. The count snaps back to the observed planet.
12. Why It Is Structurally Stable
A local mechanical or atomic clock measures a process inside Earth's local physical environment. That local measurement can require correction for gravitational, relativistic, or environmental effects.
The Maya Venus system uses a different kind of reference. Its anchor is not only a local device. Its anchor is a repeated astronomical event: Venus appearing at the horizon. That makes the system structurally stable because the final authority is not a written table alone. The final authority is the observed sky.
In this corrected model, the system is not literally immune to all astronomical variation. Rather, it is protected from the specific weakness of a purely arithmetic calendar: unchecked compounding drift. Observation interrupts the drift.
13. System Drift Blueprint
The structural difference between localized time tracking, a predictive table, and the C7 Page 24 reading is visualized below:
14. Summary of the Corrected Mechanism
- Historical number: 365.2420 belongs to the older Teeple-era Maya astronomy debate, not to a new personal calculation here.
- 13th Baktun: 13.0.0.0.0 marks a major cycle completion, commonly correlated with December 21, 2012.
- Post-Baktun marker: the tired or collapsed bird is interpreted in C7 as a post-cycle entropy-drop marker.
- Venus oscillator: observed Venus synodic return, approximately 583.920 days.
- Solar layer: seasonal calibration is needed for the tropical year.
- Corrected math: the Venus synodic equation gives the Earth sidereal period, not directly 365.2420.
- Prediction table: the Dresden Venus Table can require periodic correction.
- Operational clock: the observed heliacal rise of Venus can reset the cycle.
- C7 contribution: table correction, sky reset, and post-13th-Baktun visual marking are treated as different mechanisms.
The 365.2420 Problem: Teeple, Yoshiho, Aldana, Bricker, and the C7 Reset Model
For decades, a debate has existed beneath the surface of Maya scholarship: Did the Maya calculate or approximate the tropical year as 365.2420 days? One tradition says yes. Another rejects the claim because some older arguments were built on weak or disputed evidence. The corrected position is more careful: the number should not be defended through a broken two-number Venus derivation. It should be examined as part of a layered observational system combining Venus, solar-seasonal calibration, long-counted intervals, and table correction.
This article does not present the 365.2420 number as a new personal discovery. It treats that value as a historical claim from the Teeple-era debate. The new C7 contribution is the reset-versus-correction model and the post-13th-Baktun Page 24 proof chain.
Part I: John E. Teeple — The Historical Claim
John E. Teeple was a chemical engineer and amateur Mayanist who argued that the Maya had calculated the length of the tropical year as 365.2420 days and used it in calendar correction. His argument relied on determinant theory, disputed glyph interpretations, and a specific Long Count date.
Teeple's argument rested on:
- Determinant theory: the idea that certain Maya glyphs acted as seasonal markers.
- A disputed Long Count date: 9.14.13.15.19.
- A correction mechanism: the idea that the Maya used calendar relationships to correct the 365-day Haab' against seasonal drift.
The corrected position is that Teeple may have been pointing toward a real high-precision solar problem, but his proposed proof was weak. C7 does not depend on Teeple's proof.
Part II: Yasugi Yoshiho — The Critique
Yasugi Yoshiho challenged Teeple's theory and argued that Teeple's evidence did not support the claim. The critique focused on weak glyph evidence, inconsistent determinant readings, and the disputed Long Count date.
- No convincing direct text: Teeple's determinant theory did not clearly appear in Maya inscriptions as a systematic correction rule.
- Inconsistent glyph readings: the supposed determinant glyphs were not used consistently enough to prove the theory.
- Disputed data: the Long Count date used by Teeple was argued to be unsupported.
The corrected response is that Yoshiho may have been right to reject Teeple's proof. But rejecting Teeple's proof does not automatically prove that the Maya lacked high-precision solar knowledge. It only means Teeple's proposed proof should not be treated as settled.
Part III: Independent Bird Context and the Page 24 Marker
Independent scholarship has long treated bird figures in the Dresden Codex as meaningful, not merely decorative. Early studies of Maya codex animal figures identify birds by posture, markings, and glyphic context. This supports the basic premise that a bird figure on the Dresden page can be a legitimate object of analysis.
This does not mean earlier scholars identified the Page 24 bird as an entropy marker. That interpretation is C7's original contribution. The independent point is narrower but important: bird figures in the Dresden Codex are meaningful enough to study, classify, and compare.
C7 distinction: Independent scholarship can support the existence and meaningfulness of bird figures in the Dresden Codex. C7 adds a new interpretation: the tired or collapsed bird is read as a post-13th-Baktun visual entropy-drop marker within the Venus Table preface structure.
Part IV: Integer Approximation and Observational Calibration
The Maya worked with whole-number cycles. Their system naturally invited integer approximations, long-counted intervals, and repeated horizon observations. A tropical-year value near 365.2420 would not need to emerge from one equation alone. It could emerge from the combination of solar horizon tracking, Haab' drift, Venus cycles, Tzolk'in cycles, and long-duration count comparisons.
The standard Haab' year has exactly 365 days. The tropical year is slightly longer. The drift per Haab' year is:
Over a long observational span of Y years, the accumulated seasonal offset is:
This means that a high-precision solar value could be approached through long-duration comparisons between counted days and observed seasonal returns.
1. Copán-Type Long Count Comparison
One possible kind of reasoning uses long count totals and solar-year totals. For example:
This is not exactly 365.2420, but it shows the kind of whole-number approximation that could bring observers close to the tropical year.
2. Fractional Seasonal Approximation
Another approximation can be expressed as:
This is close to 365.2420. The point is not that this alone proves the Maya used that exact fraction. The point is that whole-number observational astronomy can naturally approach the tropical-year value with high precision.
3. Venus as a Stabilizing Layer, Not the Sole Derivation
The earlier version of this article claimed that 365.2420 could be derived directly from Venus's sidereal and synodic periods alone. That was too strong. The corrected model is better:
Venus does not single-handedly produce 365.2420 through the synodic equation. Venus supplies the external reset and resonance layer. The tropical-year value requires solar-seasonal calibration.
That correction strengthens the model. It removes the weak arithmetic claim and leaves the stronger structural claim: Venus acted as a reset anchor inside a larger astronomical timing system.
Part V: The Corrected Orbital Resolution
The debate between Teeple and Yoshiho took place mostly on archaeological and glyphic ground. But the Maya calendar was also an astronomical instrument. The corrected astronomical question is not, "Can two Venus numbers alone produce 365.2420?" They cannot. The better question is:
Could the Maya have used Venus tracking, solar-seasonal observation, and long-counted intervals together to approach a value near 365.2420?
The answer is much stronger. Yes, that layered pathway is plausible. It matches the way a naked-eye astronomical system would actually work. The sky supplies repeated events. The calendar counts them. The table predicts them. The observer corrects the table when the sky returns.
Why This Reframes the Debate
| Aspect | Teeple | Yoshiho | C7 Reset Model |
|---|---|---|---|
| Method | Glyph interpretation and determinant theory | Critique of Teeple's glyph evidence | Layered observation, Page 24 visual marker, and reset-window testing |
| Data source | Disputed Long Count date and glyphs | Same disputed data | Venus observations, solar-seasonal tracking, 13th Baktun context, marked Page 24 bird, numeral 8, 10 Ajaw, and C7 equation |
| 365.2420 Status | Historical claim through weak proof | Rejected due to weak proof | Historical reference value, not a new C7 calculation |
| Main correction | Right problem, weak evidence | Right critique, possibly too broad a rejection | Separate table correction, sky reset, and post-Baktun visual marking |
Part VI: The 584-Day Reset — Why the Framework Changes
Everything discussed up to this point has usually been measured through a linear-calendar framework: compare one year length against another and watch the drift accumulate over centuries.
That framework is incomplete. It treats the Maya system as if it were only an arithmetic calendar. But the Maya system also used observation. This changes the meaning of drift.
The C7 critical oversight: The predictive table may accumulate drift, but an observed Venus heliacal rise can reset the working cycle. The table may require correction. The sky clock can re-anchor itself through observation. Page 24 also contains a post-13th-Baktun visual marker in the C7 reading.
The Structural Error Ceiling
If a tropical-year estimate differs from the modern value by 0.0002 days per year, the theoretical drift is approximately 17.28 seconds per year. If a calendar ran forward blindly without reset, that drift would compound:
But this describes a purely linear arithmetic calendar. It does not describe an observational system that can re-anchor itself to repeated sky events.
If the working cycle is reset by direct Venus observation, then the error does not need to carry forward indefinitely. The accumulated difference can be interrupted when the real planet appears.
The Rubber Band Effect
The rubber band effect is the mechanism by which an observational calendar avoids unchecked compounding drift.
The system does not need to lock itself into counting exactly 584 days every time.
Instead, the key rule is simple: when Venus physically appears at the horizon marker, the current prediction is judged against the sky, and the working cycle can begin again from the observed event.
If Venus appears early or late relative to the prediction, the table learns from the sky. The sky is the authority.
Step 1 — The Fixed Reference Point. Venus returns to a predictable horizon position across its synodic cycle. The Maya could use architecture, sightlines, stelae, horizon notches, or repeated observational stations to mark the return.
Step 2 — The Prediction Stretches. Between observations, the table predicts where the cycle should be. Because the table uses rounded intervals, the prediction can stretch away from the true sky.
Step 3 — Venus Returns and Tests the Table. When Venus physically appears, the observed event overrides the prediction. The planet becomes the authority.
Step 4 — The Rubber Band Snaps Back. The working cycle can begin from the observed event. The prediction does not have to carry its error forward as a permanent clock error.
Step 5 — Long-Term Drift Becomes Table Maintenance, Not Clock Failure. Over decades and centuries, the written table still needs correction. But that is table maintenance. It is not proof that the living sky clock was blindly drifting.
Step 6 — Post-Baktun Visual Marking. In the C7 reading, the tired bird appears after the 13th Baktun completion and marks the visual moment of exhaustion or drop. This does not replace the Venus reset model. It adds a Page 24 visual marker to the timing chain.
Why This Is Not a Leap-Year Correction: A leap-year correction is a manual insertion into an arithmetic calendar. The rubber band effect is observational re-anchoring. The table predicts. The sky verifies. The cycle re-anchors to the observed event.
When Venus Appears Early, What Did the Maya Actually Do?
The direct answer: the observed appearance of Venus would become the governing event. The prediction table might say one thing, but the sky says the final thing.
Before the reset: the Dresden Venus Table could predict a return using a 584-day structure. But the true average synodic period is closer to 583.920 days, so a prediction can slowly separate from the observed sky.
The moment Venus appeared: a priest or astronomer watching the horizon would see the actual heliacal rise. That physical sighting would be the strongest astronomical fact. The old prediction is tested. The new cycle can be re-anchored.
What they did not need to do: they did not need to treat the table as a permanently drifting mechanical clock. They could update the table and re-anchor the working cycle to observation.
The practical result: the table can be corrected over long spans, while the operational cycle remains tied to the real sky.
Part VII: The Aldana/Bricker Misinterpretation — The European-Model Error
The pattern of interpreting Maya astronomy through a European calendar lens did not end with Teeple and Yoshiho. It also appears in modern discussions of the Dresden Codex Venus Table, including the work of Gerardo Aldana and the Bricker tradition.
The issue is not that those scholars noticed corrections. The corrections are real and important. The issue is what kind of correction they are.
The Claim: Venus Correction as Leap-Year Equivalent
Modern interpretations often describe the Dresden Venus Table corrections as if they function like a leap-year system. In that view, the Maya let a calendar accumulate error, then periodically subtract days to fix the drift.
This framing can be useful at the table level, but it becomes misleading if it is applied to the whole Maya astronomical system.
The flaw in the framing: A correction to a predictive table is not the same as a correction to the observed sky clock. The table can require arithmetic repair while the living astronomical cycle remains anchored to direct observation.
What They Missed: Table Correction vs. Clock Reset
The Venus Table in the Dresden Codex was a predictive guide. It helped forecast future Venus events. Like any predictive table, it could drift relative to real observations over long spans. The corrections kept the table aligned with the sky.
But the observed sky event itself is different. When Venus appeared, that appearance was not merely an arithmetic correction. It was a direct astronomical reset point.
- The Clock: the observed Venus return at the horizon.
- The Table: the written predictive guide.
- The Correction: the update needed to keep the table useful.
- The Reset: the observed event that re-anchors the working cycle.
- The C7 Marker: the tired bird as a post-13th-Baktun visual marker.
These are different functions. The table was maintained. The sky was observed. The prediction was not the planet. The tired bird is the C7 visual marker for the post-cycle drop.
The Same Pattern: Three Generations of Misinterpretation
The same category mistake appears repeatedly: scholars see correction and assume it means a European-style calendar repair. But correction can also mean table maintenance.
| Scholar(s) | Era | What They Claimed | The Category Issue |
|---|---|---|---|
| John E. Teeple | 1920s–1930s | Maya used determinant glyphs to correct the Haab' calendar against seasonal drift and proposed a 365.2420-day tropical-year value. | Overbuilt a correction theory from weak evidence. |
| Yasugi Yoshiho | 1990s | Rejected Teeple's determinant theory and challenged the 365.2420 claim. | Correctly challenged the proof, but may have rejected too much. |
| Gerardo Aldana / Harvey & Victoria Bricker | 1980s–2016 | Interpreted Dresden Venus Table corrections as sophisticated long-term correction schemes. | Correct about table correction, but the C7 reset model separates table maintenance from sky-clock re-anchoring. |
| C7 Page 24 Reading | 2025–2026 | Uses the tired bird, numeral 8, 10 Ajaw, Venus preface context, and C7 equation to identify a post-13th-Baktun entropy-drop window. | Separates historical 365.2420 context from the new Page 24 visual-numerical timing chain. |
Why This Keeps Happening
The repeated problem is the assumption that a calendar must behave like a European linear calendar. In that model, the calendar runs forward, error accumulates, and a human correction rule repairs the error.
The Maya system can be understood differently. It combines counted cycles with observed sky events. The count matters. The table matters. The observed planet matters. In the C7 reading, the visual marker also matters.
The record should be reframed: The Dresden Venus Table corrections should be understood as updates to a predictive document. They do not automatically prove that the operational sky clock was a blindly drifting arithmetic calendar. The Venus return itself functioned as an observational re-anchor. In C7, the post-13th-Baktun tired bird adds a visual marker for the entropy-drop reading.
References
- Teeple, John E. Maya Astronomy, early twentieth-century work associated with the historical 365.2420-day Maya tropical-year claim.
- Yoshiho, Yasugi. Work challenging Teeple's determinant theory and the evidence behind the 365.2420-day claim.
- Aldana, Gerardo. "Discovering Discovery: Chich'en Itza, the Dresden Codex Venus Table and 10th Century Mayan Astronomical Innovation." Journal of Astronomy in Culture, 2016.
- Bricker, Harvey M. and Victoria R. Bricker. Astronomy in the Maya Codices. American Philosophical Society, 2011.
- Tozzer, Alfred M. and Allen, Glover M. Animal Figures in the Maya Codices. Peabody Museum, Harvard University. Used here as general support that animal and bird figures in Maya codices are meaningful objects of classification and interpretation.
Conclusion
The 365.2420-day value is not presented here as my personal discovery. It belongs to the older Teeple-era Maya astronomy debate. Teeple may have been right that the Maya reached a value close to 365.2420, but his proposed proof was weak. Yoshiho was right to challenge Teeple's evidence, but that does not prove the Maya lacked high-precision solar knowledge.
The revised model is therefore simple. The 365.2420-day value should not be claimed as a direct two-number result from the Venus synodic equation alone. That equation gives the Earth sidereal orbital period when Venus sidereal and synodic periods are used. The tropical year requires solar-seasonal calibration.
The real contribution of C7 is the reset-versus-correction distinction plus the post-13th-Baktun Page 24 marker. The Dresden Venus Table may require correction because it is a predictive document. But the living astronomical clock can reset whenever Venus is physically observed at the horizon. The table predicts. The sky verifies. The planet resets the cycle.
The tired or collapsed bird is not treated here as a random bird. In the C7 reading, it is the post-13th-Baktun visual entropy-drop marker. The numeral 8 is the timing key. 10 Ajaw is the calendrical anchor. Page 24 is the Venus Table preface. The C7 equation supplies the July 17, 2025 entropy-drop window.
This is the final corrected claim: the Maya Venus system combined prediction-table mathematics with direct sky reset. The historical 365.2420 value belongs to the solar-seasonal debate. The C7 contribution is the accuracy framework and the Page 24 proof chain: post-13th-Baktun tired bird, numeral 8, 10 Ajaw, Venus structure, and July 17, 2025.
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