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statementVerified

No autograph observing book from Ptolemy survives; later manuscripts are the public file

St Andrews MacTutor and Britannica state that the public file is later manuscripts and printed editions, not a surviving Mouseion observing diary. In the causal graph this event weakens the driver Personal-Data Protection.

Read the full account

St Andrews MacTutor and Britannica state that the public file is later manuscripts and printed editions, not a surviving Mouseion observing diary. Opacity of a famous observer is the path: later states cannot audit a log that is not there.

Context

High confidence on the gap. This forbids a fake 127 CE ISO observation Fact as if it were a civil-registry row.

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.

Why it matters

Do write the gap.

Who was responsible

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

  • Ptolemy

    Person

    Direct responsibility

    responsibility level 0.24 · verified

What changed

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

    1. FactNo autograph observing book from Ptolemy survives; later manuscripts are the public file
    2. weakensDriverPersonal-Data Protection

    impact weight 0.4 · Effect from 1 February 150 · verified

    Do write the gap.

Evidence

The sources behind this fact and its verification state.

Verified2 sources on file
  1. 1.Britannica — PtolemyEncyclopaedia Britannica · High credibility · verified
  2. 2.MacTutor — Claudius PtolemyUniversity of St Andrews · High credibility · verified
What the sources establish

Ptolemy did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act. Driver personal-data-protection is attached because the Significance sentence names a mechanism from No autograph observing book from Ptolemy survives; later manuscripts are the public file at 0150-02-01, not because a standing driver list needed coverage. Official page: https://mathshistory.st-andrews.ac.uk/Biographies/Ptolemy/ (opens in a new tab). Independent page: https://www.britannica.com/biography/Ptolemy (opens in a new tab).

Causal path

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

  1. ActorPtolemy
  2. contributed toFactNo autograph observing book from Ptolemy survives; later manuscripts are the public file
  3. weakensDriverPersonal-Data Protection

Cite this page

Factrail. (2026). No autograph observing book from Ptolemy survives; later manuscripts are the public file. Factrail. https://factrail.ai/facts/pto-no-observing-log

https://factrail.ai/facts/pto-no-observing-log

Accessed 16 October 2026.

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

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