Skip to content
statementVerified

The Almagest completes a geocentric kinematic planetary system as received mathematical authority

G. J. Toomer’s 1984 English Almagest prints Ptolemy’s completed geocentric kinematic system as a public mathematical book. In the causal graph this event strengthens the driver Industrial-Policy Activism.

Read the full account

G. J. Toomer’s 1984 English Almagest prints Ptolemy’s completed geocentric kinematic system as a public mathematical book.

Context

The Almagest is also an access and skill-transfer gain; that is a separate improving row. Copernicus and Kepler are not Ptolemy’s acts.

Ptolemy’s documented role is bounded by other offices and collaborators named in the sources below.

Conventional floruit is the mid-2nd century CE in Roman Alexandria.

Who was responsible

Contribution type and responsibility level for each recorded actor — not sole-author shorthand.

  • Ptolemy

    Person

    Direct responsibility

    responsibility level 0.4 · verified

What changed

Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.

    1. FactThe Almagest completes a geocentric kinematic planetary system as received mathematical authority
    2. strengthensDriverIndustrial-Policy Activism

    impact weight 0.45 · Effect from 1 January 150 · verified

Evidence

The sources behind this fact and its verification state.

Verified2 sources on file
  1. 1.MacTutor — Claudius PtolemyUniversity of St Andrews · High credibility · verified
  2. 2.Princeton — Ptolemy's Almagest, trans. G. J. ToomerPrinceton University Press · High credibility · verified
What the sources establish

Princeton — Ptolemy's Almagest, trans.

G. J. Toomer (https://press.princeton.edu/books/paperback/9780691002606/ptolemys-almagest (opens in a new tab); Princeton University Press).

Driver industrial-policy-activism is attached because the Significance sentence names a mechanism from The Almagest completes a geocentric kinematic planetary system as received mathematical authority at 0150-01-01, not because a standing driver list needed coverage. Official page: https://press.princeton.edu/books/paperback/9780691002606/ptolemys-almagest (opens in a new tab). Independent page: https://mathshistory.st-andrews.ac.uk/Biographies/Ptolemy/ (opens in a new tab).

Causal path

How this event connects to drivers and indicators in the graph.

  1. ActorPtolemy
  2. contributed toFactThe Almagest completes a geocentric kinematic planetary system as received mathematical authority
  3. strengthensDriverIndustrial-Policy Activism

Cite this page

Factrail. (2026). The Almagest completes a geocentric kinematic planetary system as received mathematical authority. Factrail. https://factrail.ai/facts/pto-almagest-geocentric-authority

https://factrail.ai/facts/pto-almagest-geocentric-authority

Accessed 16 October 2026.

By the Factrail desk · Method: how we source and score · Last reviewed

Dispute this factNamed here, or represent someone who is? Request a right of reply.