trustme.bro/r/…
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the claim
Dividing total insolation by four accounts for the ratio of Earth's cross-section to its surface area.
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

This is a basic geometric and physical fact about planetary energy balance (dividing a disk interception area of pi times radius squared by a spherical surface area of four pi times radius squared gives one-fourth), so no formal citation is necessary.

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The analysis

The claim represents a fundamental, standard geometric calculation used in planetary energy balance models to convert solar constant (total solar irradiance) into an average surface insolation. It is a matter of basic mathematical definition and geometric derivation rather than an empirical hypothesis needing literature validation. Following the instructions for truisms and direct definitions, this is classified as COMMON_KNOWLEDGE.

Everything we examined (12)
  1. Climate change and public health in Germany - An introduction to the German status report on climate change and health 2023.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Global mean sea level likely higher than present during the holocene.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Ethical thinking in occupational and environmental medicine: Commentaries from the Selikoff Fund for Occupational and Environmental Cancer Research.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Project Earthrise: Proceedings of the Ninth Annual Conference of <i>in</i>VIVO Planetary Health.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Emerging hemispheric asymmetry of Earth's radiation.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Revisiting Keynes in the Light of the Transition to Circular Economy.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Hydrologic cycle weakening in hothouse climates.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Evaluating the benefits of urban green infrastructure: Methods, indicators, and gaps.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Nonuniform water distribution in Jupiter's midlatitudes: Influence of precipitation and planetary rotation.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Water Versus Land on Temperate Rocky Planets.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Monsoonal imprint on late Quaternary landscapes of the Rub' al Khali Desert.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → COMMON KNOWLEDGE · 9505 Aug 2026
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