We publish our audit record because accuracy claims should be checkable. Every entry on this site runs through an automated fact-audit pipeline (accuracy audit → source-grounded repair → visual QA); this page is generated from that pipeline's own report, not written by hand.
Last full accuracy audit: 2026-09-10 · 24 entries checked · 18 flagged · 37 issues confirmed · 18 corrected · 19 still open
Ancient Greek astronomy — The claim that 'Eudoxus is typically thought to have standardized the names of the constellations' is incorrect; standardization of constellation names is more commonly attributed to Ptolemy or Hipparchus.
Ancient Greek astronomy — The claim that 'Aristarchus of Samos was the first and only premodern figure to propose a truly heliocentric model of the Solar System' is inaccurate because other premodern figures (e.g., in ancient India or medieval Europe) also proposed heliocentric or simi
Astronomical rings — The entry claims that the instrument consists of three rings representing the celestial equator, declination, and the meridian, but the standard historical design of Gemma's rings typically includes the meridian, the equator (or equinoctial ring), and a movabl
Astronomical rings — The entry states that 'Parts of this instrument trace back to devices built and used by ancient Greek astronomers,' but there is no established historical evidence that the specific three-ring portable device known as Gemma's rings directly traces back to anci
Celestial Sphere Woodrow Wilson Memorial — The sphere is not located in 'Ariana Park'; it is situated in the Court d'Honneur of the Palais des Nations.
Celestial spheres — Anaximander did not envision celestial spheres; his model involved rings or wheels, not nested spheres.
Celestial spheres — Anaximenes did not describe stars as fastened on a revolving crystal sphere; that idea conflates his view with later developments.
Counter-Earth — The claim that Philolaus' system had the Earth and Counter-Earth completing a revolution around the Central Fire every 24 hours is misleading because the Counter-Earth's orbital period is not independently specified as exactly 24 hours in surviving sources.
Counter-Earth — The claim that NASA's STEREO probes would have detected a Counter-Earth at the L3 point during the first half of 2007 is incorrect because STEREO reached the L3 region in 2009, not 2007.
Deferent and epicycle — The claim that 'neither circle is centered on Earth; each planet's motion is centered at a planet-specific point called the eccentric' is misleading because the epicycle's center moves on the deferent, not centered on the eccentric point.
Deferent and epicycle — The claim that 'All planets' epicycles revolved in lockstep with Ptolemy's Sun, giving them a one-year period' is incorrect for inner planets (epicycle period tied to synodic period) and for outer planets (deferent period is roughly one year, not the epicycle)
Equant — The claim that the equant was introduced to explain the apparent retrograde motion of all Solar System bodies except the Sun and Moon is inaccurate; the equant was used to account for variations in speed (anomaly in longitude), not retrograde motion, which was
Equant — The statement that Ptolemy relied on observations by 'a certain Theon (perhaps Theon of Smyrna)' is misleading; Ptolemy does not cite Theon of Smyrna as a source for the equant or for observations in the Almagest, relying instead on his own observations and th
Exeligmos — The entry states 'the gamma increases or decreases because an exeligmos is about three hours shorter than a draconic month.' This is incorrect: an exeligmos is not about three hours shorter than a draconic month; the exeligmos is about 54 years and 33 days, wh
Exeligmos — The entry states 'The Antikythera mechanism used epicyclic gearing to predict dates of consecutive exeligmoses.' This is not supported by widely-known canon: there is no evidence the Antikythera mechanism used epicyclic gearing specifically for exeligmos predi
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