Planetary Hypotheses presents nested spheres as a physical planetary system
Planetary Hypotheses presents a nested-sphere physical system under Ptolemy’s name. In the causal graph this event weakens the driver Industrial-Policy Activism.
Read the full account
Planetary Hypotheses presents a nested-sphere physical system under Ptolemy’s name. The dated physicalising treatise is not the Almagest’s kinematic tables and not Tetrabiblos. Ptolemy’s documented role is: He wrote a physicalising sequel to the Almagest’s kinematics. Later Arabic and Latin are carriers; he did not typeset them. Hypotheses is a physical sequel. Later editors, printers, and excavators remain named where they appear.
Context
A mathematical astronomer writing physics, unnamed copyists, and later Arabic transmitters already sit in the file. A sphere-book is not unique authorship of every later orrery. Later Toomer is access, not 150 type. Named others on the file: Unnamed copyists, later Arabic translators, and neighbouring Almagest readers share the treatise. The public setting is the file around 0150-05-01. The instrument stays Planetary Hypotheses presents nested spheres as a physical planetary system. The setting of Planetary Hypotheses presents nested spheres as a physical planetary system is the public file around 0150-05-01. Driver industrial-policy-activism is attached because the significance names a mechanism from this act, not because a standing list needed coverage.
That reading is an impact-path choice, not a property stored on the Fact itself.
Why it matters
Complex later carrier. Welfare reading worsening. The attached mechanism is A dated physical-spheres treatise locked a geocentric machine as a working cosmos, distinct from the Almagest as kinematic authority. Lag to any modern indicator is not treated as zero. This path is attached because the mechanism is named from this act, not because a driver list needed coverage. The welfare reading on this path is worsening.
Shared responsibility is part of Planetary Hypotheses presents nested spheres as a physical planetary system. Naming Ptolemy does not delete co-authors, institutions, or later transmitters. The lag from 0150-05-01 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Ptolemy
PersonDirect responsibility
responsibility level 0.36 · verified
He wrote a physicalising sequel to the Almagest’s kinematics. Later Arabic and Latin are carriers; he did not typeset them.
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactPlanetary Hypotheses presents nested spheres as a physical planetary system
- weakensDriverIndustrial-Policy Activism
impact weight 0.35 · Effect from 1 May 150 · verified
A dated physical-spheres treatise locked a geocentric machine as a working cosmos, distinct from the Almagest as kinematic authority.
Evidence
The sources behind this fact and its verification state.
- 1.Britannica — Almagest and related Ptolemaic worksEncyclopaedia Britannica · High credibility · verified
- 2.Britannica — Ptolemy, Planetary HypothesesEncyclopaedia Britannica · High credibility · verified
What the sources establish
Britannica independently identifies Planetary Hypotheses as a distinct Ptolemaic work. Official: Britannica — Ptolemy, Planetary Hypotheses (https://www.britannica.com/biography/Ptolemy (opens in a new tab); Encyclopaedia Britannica). Independent: Britannica — Almagest and related Ptolemaic works (https://www.britannica.com/topic/Almagest (opens in a new tab); Encyclopaedia Britannica). The two URLs are different pages. Where the carrier is a later edition or a received narrative, that limit is stated rather than upgraded to an autograph. Official carrier: Britannica — Ptolemy, Planetary Hypotheses (https://www.britannica.com/biography/Ptolemy (opens in a new tab); Encyclopaedia Britannica). Independent carrier: Britannica — Almagest and related Ptolemaic works (https://www.britannica.com/topic/Almagest (opens in a new tab); Encyclopaedia Britannica).
Established: Planetary Hypotheses as a Ptolemaic treatise. Not established: that the Almagest is this same book. Established: a sourced public record of Planetary Hypotheses presents nested spheres as a physical planetary system under 0150-05-01.
If a number is not in the two records named above, it is not supplied here.
Later competitions, monuments, translations, UNESCO listings, museums, and adaptations are not converted into extra lifetime acts.
Confidence is stated on the impact path, not hidden in adjectives. Hypotheses is a physical sequel. Mixed effects of Planetary Hypotheses presents nested spheres as a physical planetary system are separate paths.
Causal path
How this event connects to drivers and indicators in the graph.
- ActorPtolemy
- contributed toFactPlanetary Hypotheses presents nested spheres as a physical planetary system
- weakensDriverIndustrial-Policy Activism
Cite this page
Factrail. (2026). Planetary Hypotheses presents nested spheres as a physical planetary system. Factrail. https://factrail.ai/facts/pto-planetary-hypotheses
https://factrail.ai/facts/pto-planetary-hypotheses
Accessed 17 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.