{
 "schema": "nephos.method.v1",
 "slug": "monet-thames-below-westminster-1871",
 "title": "Claude Monet, The Thames below Westminster, about 1871, NG6399",
 "urls": [
  "/studies/monet-thames-below-westminster-1871"
 ],
 "written": {
  "summary": "The canvas is inscribed “Claude Monet 71”. The holder places Monet in London from September 1870 to May 1871; his letter from Zaandam establishes that he had left by 2 June. January–May is the dated-year segment; September–May supplies wider stay context. Neither identifies a painted day.",
  "items": [
   {
    "quote": "Zaandam ce 2 juin 71",
    "source": "Monet to Pissarro, 2 June 1871; Zaans Museum French transcription, p. 2",
    "url": "https://zaansmuseum.nl/wp-content/uploads/2019/06/Brief-Monet.pdf"
   },
   {
    "quote": "Fog! Visibility less than two paces.",
    "source": "Daubigny to Rochenoire, 15 October 1870; Herring (2019), note 19, citing Moreau-Nélaton (1925), p. 102",
    "url": "https://www.nationalgallery.org.uk/paintings/catalogues/herring-2019/st-paul-s-from-the-surrey-side"
   }
  ]
 },
 "records": [
  {
   "name": "Greenwich daily wind and weather, 1870–71",
   "detail": "273 daily rows, manually transcribed. Wind travel and fog tokens stay separate; all nine wind sums reproduce the printed totals.",
   "url": "https://geomag.bgs.ac.uk/data_service/data/yearbooks/YBpdf/YB_GRW_1870.pdf#page=147"
  },
  {
   "name": "Monthly humidity in the same yearbooks",
   "detail": "Published Degree of Humidity ranges from 74 to 90, on a scale where saturation is 100. These are monthly summaries.",
   "url": "https://geomag.bgs.ac.uk/data_service/data/yearbooks/YBpdf/YB_GRW_1871.pdf#page=122"
  }
 ],
 "gaps": [
  "No verified painting session or daily smoke concentration is available.",
  "Greenwich cannot establish the atmosphere along Monet’s Westminster sightline.",
  "The original Daubigny letter was not inspected; its dated testimony is read through the National Gallery’s scholarly catalogue."
 ],
 "tests": [
  {
   "claim": "Were fog and weaker winds available during the dated year?",
   "result": "January–May 1871 has 29 days with a fog notation out of 151. Median daily wind travel is 164 miles on those days and 271 on the others."
  },
  {
   "claim": "Does the broader stay give similar context?",
   "result": "September–May has 86 fog-notation days out of 273; the corresponding medians are 154 and 289 miles. The month-by-month table retains the April exception."
  },
  {
   "claim": "Does this test the PNAS pollution trend or date the picture by the Sun?",
   "result": "It supplies a meteorological consistency check only. Albright and Huybers study trends across works; Baker and Thornes study solar positions in the later Parliament series. Neither supplies a date or aerosol calibration for NG6399."
  }
 ],
 "finding": "The registers support recurring fog and an association with weaker daily wind during Monet’s stay. They do not determine how much of the painted haze was smoke, or which weather Monet painted.",
 "verdicts": [
  {
   "claim": "Meteorological setting for the misty picture",
   "verdict": "Partially agrees",
   "reason": "Compatible conditions recur at Greenwich; the match in place, hour and composition remains unproved."
  },
  {
   "claim": "Painted day and aerosol amount",
   "verdict": "Unknown",
   "reason": "The necessary dated session and direct or calibrated pollution evidence are missing."
  }
 ],
 "limits": [
  "A day with no fog code is not necessarily a clear day. A fog code says nothing about duration or chemical composition.",
  "Monthly humidity cannot be paired with individual painting sessions. Wind travel is an integrated historical instrument reading.",
  "The wind association is descriptive and may reflect season and other weather conditions. The page preserves all months and both date windows.",
  "The National Gallery identifies heightened Parliament towers and scumbled light; the painting is a constructed image, not an unaltered optical measurement."
 ]
}