820 canonical forms + 578 route stages.
THE TIMELINE ATLAS
JOURNEY ATLAS ↗FORM / ROUTE / BOUND
1398 REVIEWED EVENTSLANGUAGE
IN TIME.
One cross-word chronology for every defensibly bounded form and journey stage—without converting a vague historical label into a fake year.
A reviewed graph bound, not a claim of an earliest human word.
Only stages with directly cited numeric bounds enter this atlas.
Labels remain visible in Journey Atlas, but not parsed into false years.
004 MATCHING EVENTS
FILTER THE CHRONOLOGY
WHEN DID THE EVIDENCE LAND?
TWO CLOCKS.
NO FALSE PRECISION.
FORM CHRONOLOGY dates a canonical linguistic form or reconstruction in the lexical graph.
ROUTE CHRONOLOGY dates a geographic or transmission stage in a word’s journey.
They can share an era band, but they are never silently treated as the same kind of claim.
CROSS-WORD CHRONOLOGY / EARLIEST BOUND FIRST
THE EVIDENCE IN TIME
Antiquity2 ON THIS PAGE
300 BCE–500 CErange
ROUTE STAGERoman world
calculus
Latin antiquity
Latin calculus names a pebble, a bodily stone, a counting-board pebble, a calculation, or an account.
1 EVIDENCE LINK
The interval locates the reviewed Latin lexical horizon, not the first use of each sense.
AUDIT RECORD ↗300 BCE–600 CErange
ROUTE STAGERoman world
calculator
Latin antiquity and Late Latin
Calculus, calculāre, and calculātor connect counting pebbles, computation, and the human arithmetic teacher.
2 EVIDENCE LINKS
The broad interval locates the reviewed Latin lexical family rather than one coinage event.
AUDIT RECORD ↗Early modern2 ON THIS PAGE
1666 CEexact
ROUTE STAGEEngland
calculus
1666 English record
Merriam-Webster reports calculus in English in 1666 for a method or result of calculation.
1 EVIDENCE LINK
1666 is the reviewed lexicographic first-known-use year, not proof of the first spoken use.
AUDIT RECORD ↗1666 CE →open
ROUTE STAGEGlobal mathematical and scientific English
calculus
1666–today
Calculus expands across mathematics, logic, decision theory, medicine, and dentistry.
1 EVIDENCE LINK
The interval begins at the reviewed English horizon; later technical specializations are not assigned invented first dates.
AUDIT RECORD ↗UNBOUNDED IS
A REAL RESULT.
Stages without source-backed numeric bounds stay in their complete Journey Atlas route, carry an explicit temporal note, and remain absent here until the evidence supports normalization. The missing point is visible work—not permission to guess.