The Dresden Screenfold
A screenfold of bark paper (amate), read in red and black like the Codex Dresdensis, the oldest surviving Maya book. Swipe the leaves sideways. Each leaf works: a bar-and-dot calculator, Dave's typed cipher read as Maya numbers, the real Venus table, the real eclipse-warning intervals, and the calendar-round wheel. Every change is recorded on Dave's DurableAnchor ledger below. Labels: LIT sourced fact · MODEL computed here · READING an interpretation, not a decipherment.
I · Bar, dot, shell
LITMaya numerals are written with a dot for 1, a bar for 5 and a shell for 0, stacked in places of 20 (bottom place first). Calendar counts use 18 in the third place (1 tun = 360 days).
II · Dave's cipher
READINGType dots . and bars |; spaces separate glyphs. Each group is read as one Maya numeral. A valid glyph has at most 4 dots and 3 bars (0–19).
III · Venus table
LITDresden pp. 24 and 46–50. Each Venus round of 584 days is split 236 (morning star) + 90 (gone) + 250 (evening star) + 8 (gone). Five rounds fill 2920 days = 8 haab years; the table runs 13 times: 37,960 days = 146 tzolk'in = 104 years.
IV · Eclipse warnings
LITDresden pp. 51–58: 69 stations over 405 lunations, 11,960 days. Most steps are 177 days (6 moons, written 8.17), a few are 148 (5 moons, written 7.8) before each of the 10 eclipse pictures; some 177s are counted as 178 (7 in the column summary used here, giving 11,959; the stated span is 11,960, and the literature discusses both 11,959- and 11,960-day versions). Step through and the station lights when an eclipse window is warned.
V · Calendar round
LITThe tzolk'in (13 numbers × 20 day names = 260) and haab (18 months × 20 + 5 Wayeb = 365) mesh like gears; they realign every 18,980 days (52 years). MODELDates use the GMT correlation 584283; creation day 4 Ajaw 8 Kumk'u.
Sources: SLUB Dresden, codex contents (page map); SLUB digital facsimile; H. M. Bricker & V. R. Bricker, Astronomy in the Maya Codices (2011) and "Classic Maya Prediction of Solar Eclipses", Current Anthropology 24 (1983); J. E. S. Thompson, A Commentary on the Dresden Codex (1972); Justeson & Bricker, Science Advances (2025). Stated interval groups follow the eclipse-table column summary in Gates (1932) as tabulated in Spanish-language reviews. Drawings here are original, not copied glyphs.
DURABLEANCHOR LEDGER · Dave's kernel, running in this page
provisioning…
self-checks (kernel, then page)
Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on