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the claim
The amount of UVA radiation received depends on the day of the year
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
1 source for · 0 against

The amount of UVA radiation received depends on the day of the year due to seasonal changes in solar elevation and atmospheric path length, making this relationship common knowledge.

Evidence for · 1
Sun exposure (UVB, UVA, and blue‐violet visible light) in ordinary daily situations
2021 · cited by 10
This paper notes that the intensity of solar radiation reaching the skin varies with the season of the year.
See more details
The analysis

The claim that the amount of UVA radiation received depends on the day of the year is a matter of basic astronomical and meteorological observation (common knowledge), and paper [1] explicitly supports that solar radiation intensity varies by the season of the year.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. UVA EXPOSURE AND PITUITARY SECRETION. VARIATIONS OF HUMAN LIPOTROPIN CONCENTRATIONS (βLPH) AFTER UVA EXPOSUREpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Sun exposure (UVB, UVA, and blue‐violet visible light) in ordinary daily situationspeer-reviewedsupports
  3. Higher Sun Exposure is Associated With Lower Risk of Pediatric Inflammatory Bowel Disease: A Matched Case-control Studypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. A One-Month Monitoring of Exposure to Solar UV Radiation of a Group of Construction Workers in Tuscanypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Diagnostic Performance of a Fecal Immunochemical Test-Based Colorectal Cancer Screening Program According to Ambient Temperature and Humiditypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Seasonal Minimum and Maximum Solar Ultraviolet Exposure Measurements of Classroom Teachers Residing in Tropical North Queensland, Australiapeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Ultraviolet radiation thin film dosimetry: A review of properties and applications.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Linking the Ultraviolet Index to the "shadow rule" for sun protection: A theoretical model applied with a southern hemisphere example.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Angular-Dependent Energy-Saving Smart Windows.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Seasonal and Environmental Determinants of Maternal and Neonatal Vitamin D Status: A Cross-Sectional Observational Cohort Study in Urban Greece.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Occupational exposure to solar ultraviolet radiation among outdoor workers in Lisbon, 2023-first results of the MEAOW study.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Global Perspectives on Regional Sun Protection Factor (SPF) Requirements: Scientific and Regulatory Insights.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 5806 Aug 2026
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