Earth's axial tilt, not its distance from the Sun, causes seasons.

1. Pass Title matches the evidence

   Title says axial tilt, not distance, causes seasons, matching the False finding and the timing, hemisphere, and obliquity evidence.

2. Pass No obvious contradictions

   Finding, answer, and conclusion agree that the distance-only claim is false; the distance effect is described consistently as secondary.

3. Pass Plausible justification

   Conclusion explains that opposite hemispheric seasons at the same distance rule out distance as the primary cause, which a reader would accept.

4. Pass Sources are relevant

   IMCCE ephemerides, IERS conventions, and a peer-reviewed orbit and insolation model are all on topic for the seasons claim.

5. Pass Common questions answered

   Three common questions each receive a response that addresses the objection directly.

Coverage: Read the full article payload; sources judged by name/title/description/role only, per First Look's rules; no source snapshots read.

1. Concern (minor) Sourcing is strong and transparent

   Point source season-3 to the specific IERS Conventions chapter/table giving the obliquity value; the cited versions index page does not state obliquity or discuss seasons.

   Source types are strong: IMCCE ephemeris notices (primary official timing authority), IERS Conventions (primary reference standard), and a peer-reviewed GMD model paper (season-4). However, season-3 links to "conventions_versions.php", a download/changelog index; its text covers ITRF2014 parameters, leap-second subroutine updates, ocean tide models, etc., and says nothing about obliquity, a 23.4-degree value, or seasons. Evidence season-obliquity-geometry and method step 4 ("Checked the tilt mechanism against IERS reference conventions") lean on it, so a reader cannot tell where in that source the claim is supported. The mechanism is still backed by season-4, so this is Minor. Confidence: High.

   About source:season-3, evidence:season-obliquity-geometry, method:4 The finding

2. Not checked Claims are supported and labeled

   Whether each major claim is backed by its cited evidence could not be fully examined. The orbital-timing evidence (evidence:season-orbital-timing) and part of the hemisphere comparison cite only season-1 and season-2, IMCCE PDFs that FactHub could not read ("can't read 'application/pdf' sources yet"). For the parts that could be checked: the obliquity/insolation mechanism is supported by season-4's abstract; season-3 (IERS versions page) does not itself state obliquity (see sourcing-quality). The article keeps facts, inferences ("A distance-only mechanism cannot produce opposite responses simultaneously") and limitations clearly apart. Confidence: Low for the unread portion; no problem found in the readable portion beyond the season-3 anchoring issue.

3. Pass Central claims are accurate

   Summary of main claims: the article rates False the claim that seasons are caused by Earth-Sun distance, holding that axial tilt (via solar angle and day length) is the primary cause and distance a smaller secondary modulator. Claim ratings: (1) "Perihelion occurs in early January and aphelion in July" - True (well-established, uncontested; the IMCCE PDFs that would anchor it could not be read). (2) "At any instant both hemispheres have essentially the same Earth-Sun distance, but their seasons are opposite" - True (uncontested geometry). (3) "Earth's approximately 23.4-degree obliquity changes solar angle and day length" - True; season-4's abstract says obliquity, with eccentricity and precession, "controls the spatio-temporal patterns of incoming solar radiation (insolation) and the timing and duration of the seasons" and the model outputs "solar declination and day length". (4) Distance is "a small secondary modulator" - True (well-established; not quantified, see below). (5) Finding False / answer "Earth is actually closest to the Sun in January" - True. (6) Objection response: summer sunlight stronger "primarily because it arrives at a higher angle" - True. No central claim is Mixed or worse. Confidence: High that the central claims are accurate; Medium that the cited IMCCE PDFs state the dates, since they could not be read.

4. Pass Context is complete

   The article includes the key context: distance "remains a real, smaller secondary modulator", local climate depends on "geography, atmosphere, oceans", and hemispheric responses are "not a mirror image". It does not quantify the distance effect (roughly a 3% distance swing and about 7% insolation range), which would be helpful but does not change the impression. No omitted contrary evidence; the scientific consensus is uncontested. Confidence: High.

5. Pass Framing is fair and neutral

   The claim is represented as it commonly circulates ("Summer occurs because Earth is closer to the Sun..."). Objections are answered respectfully and concede what is true ("Distance does affect incoming solar energy and should not be described as irrelevant"). No loaded language or advocacy. Confidence: High.

6. Pass Uncertainty is stated

   High confidence is appropriate for an uncontested astronomical mechanism. The article states scope limits ("primary cause", not local weather), that 23.4 degrees is rounded, that no external review occurred, and item-specific limitations. No contested evidence is presented as settled. Confidence: High.

Coverage: Read the full article payload (version 2). Read sources season-3 (IERS Conventions versions page, live HTML) and season-4 (GMD landing page and abstract for Kostadinov and Gilb 2014, live HTML). Sources season-1 and season-2 (IMCCE 2024 perihelion and aphelion PDFs) returned HTTP 200 but could not be read because FactHub cannot yet extract PDF text; their content was not examined, so whether they support the stated perihelion/aphelion dates could not be verified from the sources. Accuracy of those dates was judged only as well-established, uncontested astronomical fact. No live web search used.

1. Concern (minor) Evidence is independent

   Evidence e2 reuses e1's IMCCE sources and e3's Kostadinov model; cite a source that directly documents opposite hemispheric seasons and name a specific institution.

   e1 cites season-1 and season-2 (IMCCE); e2 cites season-1, season-2, and season-4; e3 cites season-3 and season-4. Method 3 calls the hemisphere comparison "a geometry test independent of the timing argument", and logically it is, but its cited sources are the same IMCCE notices as e1 plus the same model as e3, and its second institution is the vague "Earth-system modeling community". e1 (ephemeris timing) and e3 (reference conventions plus peer-reviewed model) remain genuinely independent, so independent support remains: Minor.

   About evidence:season-hemisphere-comparison, evidence:season-orbital-timing, evidence:season-obliquity-geometry, method:3 The finding

2. Pass Rates the real claim

   Claim: "Summer occurs because Earth is closer to the Sun, and winter occurs because Earth is farther away." This is the common misconception verbatim, not a strawman. The article rates it as "whether Earth-Sun distance, rather than axial tilt, is the primary cause of ordinary annual seasons" (method 1), which matches what a reader repeating it means, and the conclusion stays within that scope while explicitly excluding regional weather. Confidence: High.

3. Pass Rating follows from the evidence

   Before reading the verdict I would choose False: e1 (January perihelion, July aphelion) runs opposite to the claim for the Northern Hemisphere, and e2 (opposite seasons at one distance) rules distance out as the cause; e3 supplies the actual mechanism. The concession that distance is "a real, smaller secondary modulator" does not make the claim Mostly true or Mixed, since the claim attributes seasons to distance. The article's finding False and answer agree. Confidence: High.

4. Pass Confidence matches the evidence

   High confidence rests on a timing observation, a geometric cross-hemisphere test, and a mechanism with a peer-reviewed model; together they are decisive for an uncontested astronomical question. The title "Earth's axial tilt, not its distance from the Sun, causes seasons" is slightly stronger than the body's "primary" cause, but the summary and conclusion carry the qualifier and the claim is about the primary cause, so a reader's belief is accurate. Limitations that matter (regional climate, distance as secondary) are stated. I would also choose High.

5. Pass Strongest objections answered

   Strongest objections I can name: (1) distance does change insolation, so it must matter - answered in objection 2 with the hemisphere argument, conceding distance is real but secondary; (2) summer sun feels stronger, so it must be closer - answered with angle/day length and aphelion timing; (3) Southern Hemisphere summer does coincide with perihelion - implicitly answered by e2 (opposite seasons at the same distance) and the secondary-modulator caveat. The article could quantify the distance effect to strengthen objection 2, but the answer rests on evidence, not assertion. Confidence: High.

Coverage: Read the full article payload (version 2): claim, finding, answer, confidence, summary, context, conclusion, three evidence items with methods, institutions, years, and limitations, three objections, six method steps, and four sources. Per the Skeptic's division of labor, no source snapshots were read and evidence was taken as stated.

1. Concern (minor) Title states the finding

   Reword the title to lead only with what is true, e.g. "Earth's axial tilt causes seasons; Earth is closest to the Sun in January."

   Title: "Earth's axial tilt, not its distance from the Sun, causes seasons." It names the subject and resolves the claim, leading with the positive finding, so it is not Material. But the "not its distance" clause is avoidable negative wording; rule: "State the verified finding in positive form instead of negating the myth." seoTitle "What Causes Seasons? Axial Tilt, Not Earth-Sun Distance" states the finding and is acceptable.

   About conclusion The finding

2. Concern (minor) Verdict fields agree and stand alone

   Change "contradicted" to "False" in the conclusion to match the current label, and make the answer stand alone: "Earth's axial tilt causes seasons by changing sunlight angle and day length."

   Read as: FactHub rates the claim "Summer occurs because Earth is closer to the Sun, and winter occurs because Earth is farther away." False (High confidence): "Tilt changes sunlight angle and day length; Earth is actually closest to the Sun in January." Fields agree in substance. Two minor lapses under the rule that fields express the conclusion "in the current label's terms" and that the answer "stands alone when quoted": (1) the changelog records the label changed from "Contradicted" to False, yet the conclusion still opens "The distance-only account is contradicted with high confidence" - stale wording; (2) the answer's bare "Tilt changes sunlight angle and day length" never says that tilt causes seasons, so quoted alone it does not state what is true about the claim.

   About conclusion The finding

3. Concern (minor) Each section does its job

   Cut summary to one sentence naming the strongest evidence; drop the hand-written evidence-map recap from context and the 'Important context' keyPoint; move the reader checklist out of method.

   Rule: "summary is one sentence naming the strongest independent lines of evidence" - the summary is three sentences. Rule: context is essential framing only and the author must not write an independence note or evidence summary the page generates - context says "The evidence map uses orbital-event timing, a simultaneous hemispheric comparison, and measured orientation-and-insolation geometry from French and international technical sources", and keyPoint 5 ("No single item is complete proof by itself... evidence from different methods and technical sources converges") is a hand-written independence note rather than something the evidence establishes. Method 6 is a reader checklist, not a method step. The conclusion does synthesize (weighs timing, hemisphere test, obliquity; states distance is secondary and local climate depends on other factors) and the editorialNote covers scope, caveats, and review status, so no Material issue.

   About conclusion, method:6 The finding

4. Concern (minor) Readers can verify it

   Give source season-3 a description saying why it was chosen and an anchor to the IERS Conventions chapter/table stating obliquity, not the generic versions page.

   Rule: sources need "short descriptions of why each was chosen" and key claims need primary anchors readers can retrieve. season-3's description, "Archives the IERS technical conventions used for precise Earth orientation and reference-system work", does not say what it supports for this article, and its title points to an archive/versions page rather than a specific chapter or identifier for the 23.4-degree obliquity. The key obliquity claim is also anchored by season-4's DOI (10.5194/gmd-7-1051-2014), so Minor. Other sources are role-labeled with full titles; method steps cover claim definition (1), independent evidence (3), sources reviewed (2, 4), and limits (5).

   About source:season-3, evidence:season-obliquity-geometry The finding

5. Concern (minor) Consistent house style

   Spell out IMCCE at first use and briefly explain perihelion, aphelion, and obliquity where first used; remove the "Fact check —" prefix from context.

   Rule: "an abbreviation is spelled out at first use" - IMCCE (in evidence e1, method 2, keyPoints-adjacent text, and source names) is never spelled out. Rule: "Technical terms a general reader would not know are explained at first use" - the summary opens with "perihelion" and "aphelion" and "measured obliquity" with no explanation (e3 later glosses obliquity as axial tilt). The context begins with a stray label "Fact check —". Numbers (23.4-degree) and names are otherwise consistent; no typos or drafting placeholders found.

   About conclusion, evidence:season-orbital-timing, method:2 The finding

6. Pass Limitations are specific

   Each limitation is item-specific: e1 "the timing comparison by itself does not explain the hemispheric reversal"; e2 "not a mirror image between hemispheres because land, ocean, elevation..."; e3 "describe top-of-atmosphere geometry, not local weather". None is boilerplate.

7. Pass Tone is measured and respectful

   Language is measured ("contradicted with high confidence", "primary", "real, smaller secondary modulator"). Strong phrases such as "rule it out as the primary mechanism" and "cannot produce opposite responses simultaneously" are justified by the stated geometry. Objection responses are respectful and concede valid points ("should not be described as irrelevant").

Coverage: Read the full article payload (version 2): title, seoTitle, description, claim, finding, answer, confidence, summary, keyPoints, context, conclusion, evidence items and limitations, objections, method steps, editorialNote, sources (role, title, identifier, description), resources, image caption and alt text, and changelog. Used only the article; no sources or web consulted.