{
 "slug": "monet-thames-below-westminster-1871",
 "object": {
  "holder": "National Gallery, London",
  "accession": "NG6399",
  "catalogued_date": "About 1871",
  "inscription": "Claude Monet 71",
  "inscription_source": "image",
  "inscription_locator": "Lower right; read directly from the hash-checked reproduction"
 },
 "windows": {
  "dated_year": {
   "start": "1871-01-01",
   "end": "1871-05-31",
   "days": 151,
   "fog_days": 29,
   "other_days": 122,
   "median_wind_fog_miles": 164,
   "median_wind_other_miles": 271.0,
   "wind_total_miles": 41529,
   "basis": "Overlap of the inscribed year 71 with the holder’s London stay; calendar boundaries, not documented painting sessions."
  },
  "stay": {
   "start": "1870-09-01",
   "end": "1871-05-31",
   "days": 273,
   "fog_days": 86,
   "other_days": 187,
   "median_wind_fog_miles": 154.0,
   "median_wind_other_miles": 289,
   "wind_total_miles": 73232,
   "basis": "Whole calendar months around September 1870–May 1871, the stay described by the National Gallery; includes uncertain arrival/departure margins."
  }
 },
 "station": {
  "name": "Royal Observatory, Greenwich",
  "id": "BGS yearbooks GRW",
  "lat": 51.483333333333334,
  "lon": 0.0,
  "coordinate_precision": "BGS rounded site coordinates, one arcminute",
  "km_to_bridge": 8.7,
  "bridge_reference": {
   "lat": 51.5008537,
   "lon": -0.1217847,
   "osm_id": 19306462
  },
  "distance_limit": "Approximate straight-line separation to Westminster Bridge; not a surveyed distance to Monet’s easel."
 },
 "measurements": {
  "wind": "Robinson anemometer: daily horizontal movement of air, miles, midnight to midnight; not an instantaneous or standardized modern surface wind.",
  "fog": "At least one f, sl.-f or th.-f in the weather row, including punctuation variants. Haze (h), mist (mt), frost (fr), and gloom (glm) alone do not qualify. No token is not proof of no fog.",
  "humidity": "Printed monthly Degree of Humidity, saturation = 100, calculated by the observatory using Glaisher’s tables. Not daily relative humidity and not an aerosol measurement.",
  "humidity_min": 74,
  "humidity_max": 90,
  "aggregation": "Medians of daily wind travel within each named window, split by whether a fog token occurs anywhere in that civil day; no pooling of stations.",
  "causal_limit": "Descriptive association. Observation timing, season and synoptic conditions are not controlled; no significance test or causal effect is claimed."
 },
 "months": [
  {
   "month": "1870-09",
   "wind_pdf_page": 147,
   "weather_pdf_page": 148,
   "printed_wind_total_miles": 6865,
   "printed_degree_of_humidity": 83,
   "days": 30,
   "fog_days": 12,
   "other_days": 18,
   "median_wind_fog_miles": 132.5,
   "median_wind_other_miles": 278.5,
   "wind_total_miles": 6865
  },
  {
   "month": "1870-10",
   "wind_pdf_page": 149,
   "weather_pdf_page": 150,
   "printed_wind_total_miles": 10124,
   "printed_degree_of_humidity": 85,
   "days": 31,
   "fog_days": 16,
   "other_days": 15,
   "median_wind_fog_miles": 236.0,
   "median_wind_other_miles": 427,
   "wind_total_miles": 10124
  },
  {
   "month": "1870-11",
   "wind_pdf_page": 151,
   "weather_pdf_page": 152,
   "printed_wind_total_miles": 7213,
   "printed_degree_of_humidity": 90,
   "days": 30,
   "fog_days": 18,
   "other_days": 12,
   "median_wind_fog_miles": 117.0,
   "median_wind_other_miles": 371.0,
   "wind_total_miles": 7213
  },
  {
   "month": "1870-12",
   "wind_pdf_page": 153,
   "weather_pdf_page": 154,
   "printed_wind_total_miles": 7501,
   "printed_degree_of_humidity": 86,
   "days": 31,
   "fog_days": 11,
   "other_days": 20,
   "median_wind_fog_miles": 139,
   "median_wind_other_miles": 274.5,
   "wind_total_miles": 7501
  },
  {
   "month": "1871-01",
   "wind_pdf_page": 121,
   "weather_pdf_page": 122,
   "printed_wind_total_miles": 8052,
   "printed_degree_of_humidity": 87,
   "days": 31,
   "fog_days": 9,
   "other_days": 22,
   "median_wind_fog_miles": 179,
   "median_wind_other_miles": 254.0,
   "wind_total_miles": 8052
  },
  {
   "month": "1871-02",
   "wind_pdf_page": 123,
   "weather_pdf_page": 124,
   "printed_wind_total_miles": 8926,
   "printed_degree_of_humidity": 86,
   "days": 28,
   "fog_days": 4,
   "other_days": 24,
   "median_wind_fog_miles": 143.0,
   "median_wind_other_miles": 329.5,
   "wind_total_miles": 8926
  },
  {
   "month": "1871-03",
   "wind_pdf_page": 125,
   "weather_pdf_page": 126,
   "printed_wind_total_miles": 8747,
   "printed_degree_of_humidity": 79,
   "days": 31,
   "fog_days": 10,
   "other_days": 21,
   "median_wind_fog_miles": 135.0,
   "median_wind_other_miles": 351,
   "wind_total_miles": 8747
  },
  {
   "month": "1871-04",
   "wind_pdf_page": 127,
   "weather_pdf_page": 128,
   "printed_wind_total_miles": 8551,
   "printed_degree_of_humidity": 83,
   "days": 30,
   "fog_days": 5,
   "other_days": 25,
   "median_wind_fog_miles": 272,
   "median_wind_other_miles": 266,
   "wind_total_miles": 8551
  },
  {
   "month": "1871-05",
   "wind_pdf_page": 129,
   "weather_pdf_page": 130,
   "printed_wind_total_miles": 7253,
   "printed_degree_of_humidity": 74,
   "days": 31,
   "fog_days": 1,
   "other_days": 30,
   "median_wind_fog_miles": 155,
   "median_wind_other_miles": 235.0,
   "wind_total_miles": 7253
  }
 ],
 "series": [
  {
   "date": "1870-09-01",
   "wind_run_miles": 288,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-02",
   "wind_run_miles": 387,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-03",
   "wind_run_miles": 273,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-04",
   "wind_run_miles": 246,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-05",
   "wind_run_miles": 400,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-06",
   "wind_run_miles": 203,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-07",
   "wind_run_miles": 214,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-08",
   "wind_run_miles": 404,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-09",
   "wind_run_miles": 485,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-10",
   "wind_run_miles": 632,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-11",
   "wind_run_miles": 143,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-12",
   "wind_run_miles": 284,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-13",
   "wind_run_miles": 324,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-14",
   "wind_run_miles": 363,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-15",
   "wind_run_miles": 111,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-16",
   "wind_run_miles": 87,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-17",
   "wind_run_miles": 189,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-18",
   "wind_run_miles": 79,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-19",
   "wind_run_miles": 120,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-20",
   "wind_run_miles": 86,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-21",
   "wind_run_miles": 91,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-22",
   "wind_run_miles": 145,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-23",
   "wind_run_miles": 225,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-09-24",
   "wind_run_miles": 161,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-25",
   "wind_run_miles": 115,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-26",
   "wind_run_miles": 122,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-27",
   "wind_run_miles": 165,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-28",
   "wind_run_miles": 144,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-29",
   "wind_run_miles": 159,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-09-30",
   "wind_run_miles": 220,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-01",
   "wind_run_miles": 267,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-02",
   "wind_run_miles": 205,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-03",
   "wind_run_miles": 154,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-04",
   "wind_run_miles": 98,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-05",
   "wind_run_miles": 96,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-06",
   "wind_run_miles": 98,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-07",
   "wind_run_miles": 145,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-08",
   "wind_run_miles": 427,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-09",
   "wind_run_miles": 331,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-10",
   "wind_run_miles": 292,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-11",
   "wind_run_miles": 205,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-12",
   "wind_run_miles": 536,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-13",
   "wind_run_miles": 690,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-14",
   "wind_run_miles": 148,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-15",
   "wind_run_miles": 107,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-16",
   "wind_run_miles": 486,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-17",
   "wind_run_miles": 423,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-18",
   "wind_run_miles": 297,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-19",
   "wind_run_miles": 511,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-20",
   "wind_run_miles": 593,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-21",
   "wind_run_miles": 272,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-22",
   "wind_run_miles": 324,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-23",
   "wind_run_miles": 464,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-24",
   "wind_run_miles": 590,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-25",
   "wind_run_miles": 317,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-26",
   "wind_run_miles": 298,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-27",
   "wind_run_miles": 393,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-10-28",
   "wind_run_miles": 334,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-29",
   "wind_run_miles": 331,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-30",
   "wind_run_miles": 369,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-10-31",
   "wind_run_miles": 323,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-01",
   "wind_run_miles": 291,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-02",
   "wind_run_miles": 89,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-03",
   "wind_run_miles": 58,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-04",
   "wind_run_miles": 104,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-05",
   "wind_run_miles": 90,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-06",
   "wind_run_miles": 102,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-07",
   "wind_run_miles": 154,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-08",
   "wind_run_miles": 103,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-09",
   "wind_run_miles": 106,
   "fog_mentioned": true,
   "fog_token": "th.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-10",
   "wind_run_miles": 394,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-11",
   "wind_run_miles": 393,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-12",
   "wind_run_miles": 317,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-13",
   "wind_run_miles": 327,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-14",
   "wind_run_miles": 335,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-15",
   "wind_run_miles": 260,
   "fog_mentioned": false,
   "fog_token": null,
   "fog_token_reason": "no_fog_token_in_complete_row"
  },
  {
   "date": "1870-11-16",
   "wind_run_miles": 238,
   "fog_mentioned": true,
   "fog_token": "sl.-f",
   "fog_token_reason": null
  },
  {
   "date": "1870-11-17",
   "wind_run_miles": 155,
   "fog_mentioned": true,
   "fog_token": "f",
   "fog_token_reason": null
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  {
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  }
 ],
 "witnesses": {
  "arrival": {
   "text": "Monet arrived in London in September 1870",
   "source": "National Gallery, NG6399, In-depth",
   "url": "https://www.nationalgallery.org.uk/paintings/claude-monet-the-thames-below-westminster"
  },
  "departure": {
   "text": "stayed until May 1871",
   "source": "National Gallery, NG6399, In-depth",
   "url": "https://www.nationalgallery.org.uk/paintings/claude-monet-the-thames-below-westminster"
  },
  "letter": {
   "text": "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"
  },
  "fog": {
   "text": "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"
  }
 },
 "unresolved": {
  "painted_day": null,
  "painted_day_reason": "no_dated_session_or_unique_solar_geometry",
  "aerosol_concentration": null,
  "aerosol_concentration_reason": "no_direct_measurement_or_validated_calibration_for_this_picture",
  "smoke_fraction": null,
  "smoke_fraction_reason": "fog_notation_does_not_identify_particle_composition",
  "daily_relative_humidity": null,
  "daily_relative_humidity_reason": "not_transcribed_or_reconstructed; monthly_summary_only",
  "westminster_weather": null,
  "westminster_weather_reason": "Greenwich_is_a_different_site",
  "modern_anomaly": null,
  "modern_anomaly_reason": "no_homogenized_like_for_like_modern_reference"
 },
 "receipts": {
  "greenwich-1870": {
   "title": "Royal Observatory, Greenwich: observations for 1870",
   "url": "https://geomag.bgs.ac.uk/data_service/data/yearbooks/YBpdf/YB_GRW_1870.pdf",
   "sha256": "b3f36953919e40426dfeb0146a26e78c8e299c82b2b8b7d3fee3c8b8e7c3c0fa",
   "retrieved_at": "2026-10-07",
   "license": "Public-domain nineteenth-century government publication; BGS scan",
   "locator": "PDF pp. 147–154, printed lxviii–lxxv; daily wind and weather, monthly humidity"
  },
  "greenwich-1871": {
   "title": "Royal Observatory, Greenwich: observations for 1871",
   "url": "https://geomag.bgs.ac.uk/data_service/data/yearbooks/YBpdf/YB_GRW_1871.pdf",
   "sha256": "cbc1a49982537d3b87572b186a57c8947dc92ce3e7c6e56ae26dc91d5bf15831",
   "retrieved_at": "2026-10-07",
   "license": "Public-domain nineteenth-century government publication; BGS scan",
   "locator": "PDF pp. 121–130, printed xlvi–lv; introduction pp. liv–lv and lx–lxii"
  },
  "transcription": {
   "title": "Nephos transcription of the Greenwich registers",
   "url": "https://geomag.bgs.ac.uk/data_service/data/yearbooks/YBpdf/YB_GRW_1870.pdf#page=147",
   "sha256": "108d4c95aa13ec0e8589f8a9e7f8eaacf41aeca3f8a291069bfe126d807dd249",
   "retrieved_at": "2026-10-07",
   "license": "Nephos transcription of public-domain factual tables",
   "locator": "273 daily rows and nine monthly humidity entries; individual page locators in JSON; one reader, not independent checking"
  },
  "museum": {
   "title": "National Gallery, The Thames below Westminster, NG6399",
   "url": "https://www.nationalgallery.org.uk/paintings/claude-monet-the-thames-below-westminster",
   "sha256": "2e7e2857a367e63f960f34168d4dc8f7942cfbbfaaa9456db72653532f804c4b",
   "retrieved_at": "2026-10-07",
   "license": "Copyright National Gallery; public research reference, short quotation and paraphrase only",
   "locator": "Object details, Overview and In-depth"
  },
  "museum-text": {
   "title": "Text extraction of the National Gallery object page",
   "url": "https://www.nationalgallery.org.uk/paintings/claude-monet-the-thames-below-westminster",
   "sha256": "d88be776987ebfb3aad5b77d97378b91db83ea4b2ea77520513b578c3b8b7bb5",
   "retrieved_at": "2026-10-07",
   "license": "Copyright National Gallery; research cache only",
   "locator": "HTML tags removed and whitespace normalized; no wording changes"
  },
  "letter": {
   "title": "Monet to Pissarro, 2 June 1871: manuscript supplied by Zaans Museum",
   "url": "https://zaansmuseum.nl/wp-content/uploads/2019/05/Brief-Claude-Monet.pdf",
   "sha256": "ff14a159a29f9fea7278ec4947e4156b390167993dcc8fae1f92d25c33c71597",
   "retrieved_at": "2026-10-07",
   "license": "Public-domain letter by Monet; museum-supplied research scan, not republished here",
   "locator": "PDF p. 1, right-hand leaf: dateline; all four PDF pages retained"
  },
  "letter-transcription": {
   "title": "Zaans Museum, transcription and translations of Monet’s letter",
   "url": "https://zaansmuseum.nl/wp-content/uploads/2019/06/Brief-Monet.pdf",
   "sha256": "ee824ed2792e317c8dd79365a96c63f29ed199ca0d6c1f97366709c681f0658e",
   "retrieved_at": "2026-10-07",
   "license": "Historical French text public domain; modern translations © their owners, short extracts only",
   "locator": "PDF p. 2: French dateline and text; p. 3: English translation"
  },
  "letter-text": {
   "title": "Text extraction of the Zaans Museum transcription",
   "url": "https://zaansmuseum.nl/wp-content/uploads/2019/06/Brief-Monet.pdf",
   "sha256": "8c6cfdcaa67dbba0b4b5599647085e688160c8af31340cc70f75862d02e3d339",
   "retrieved_at": "2026-10-07",
   "license": "Historical French text public domain; modern translations © their owners, research cache only",
   "locator": "PyMuPDF extraction of all three pages"
  },
  "daubigny": {
   "title": "Sarah Herring (2019), St Paul’s from the Surrey Side, National Gallery catalogue",
   "url": "https://www.nationalgallery.org.uk/paintings/catalogues/herring-2019/st-paul-s-from-the-surrey-side",
   "sha256": "402969a4e6b1f52e4c154fd38335c7091170c3901931fcaa937276fdf96d9c99",
   "retrieved_at": "2026-10-07",
   "license": "Copyright National Gallery; scholarly reference, short quotation only",
   "locator": "Discussion and note 19: Daubigny to Rochenoire, 15 October 1870; Moreau-Nélaton (1925), p. 102"
  },
  "daubigny-text": {
   "title": "Text extraction of Sarah Herring’s catalogue entry",
   "url": "https://www.nationalgallery.org.uk/paintings/catalogues/herring-2019/st-paul-s-from-the-surrey-side",
   "sha256": "c3c66913c20843ade8664f053f48914aed2a6d832564aa959530a73cc44a3048",
   "retrieved_at": "2026-10-07",
   "license": "Copyright National Gallery; research cache only",
   "locator": "HTML text and note 19, whitespace normalized"
  },
  "pnas": {
   "title": "Anna Lea Albright and Peter Huybers (2023), Paintings by Turner and Monet depict trends in 19th century air pollution",
   "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9963082/",
   "sha256": "3408771977b6f507f67d410f5af576fe6a9c1ebea4052d6a333f8de06185e05b",
   "retrieved_at": "2026-10-07",
   "license": "CC BY 4.0, authors; PNAS 120(6), e2219118120",
   "locator": "Main article in full; Quantifying Historical Air Pollution, Results, Discussion, Conclusions"
  },
  "pnas-text": {
   "title": "Text extraction of the PNAS article",
   "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9963082/",
   "sha256": "a4213b921ee2280062943390f55a04ad94e86e64afb4408c5f3d1ce336bb53d9",
   "retrieved_at": "2026-10-07",
   "license": "CC BY 4.0, authors",
   "locator": "HTML tags removed and whitespace normalized"
  },
  "baker-thornes": {
   "title": "Jacob Baker and John E. Thornes (2006), Solar position within Monet’s Houses of Parliament",
   "url": "https://research.birmingham.ac.uk/en/publications/solar-position-within-monets-houses-of-parliament/",
   "sha256": "dd6a0f3db8fa15f0352d06004ec9d5a9690e0e625d2c74619667800913e9e2b9",
   "retrieved_at": "2026-10-07",
   "license": "University of Birmingham repository metadata and abstract; copyright authors/publisher",
   "locator": "Abstract and bibliographic metadata only; DOI 10.1098/rspa.2006.1754; JSTOR 20209098"
  },
  "baker-thornes-text": {
   "title": "Text extraction of the Birmingham repository abstract",
   "url": "https://research.birmingham.ac.uk/en/publications/solar-position-within-monets-houses-of-parliament/",
   "sha256": "1e088d4067327ebb3a141e139098d7e143e9cd73618cba2367c16c87c0cc8674",
   "retrieved_at": "2026-10-07",
   "license": "Copyright authors/publisher; research cache only",
   "locator": "Full article not retrieved; no claim to have re-derived its geometry"
  },
  "station": {
   "title": "BGS, Greenwich observatory site coordinates",
   "url": "https://geomag.bgs.ac.uk/operations/greenwich.html",
   "sha256": "0d8ba52e5ff8886710a4bf25823461a12fb15deac885ee8cf18813ff0f75062f",
   "retrieved_at": "2026-10-07",
   "license": "BGS/UKRI public factual metadata; no map reproduction",
   "locator": "51° 29′ N, 0° 0′ E; rounded site position, not a surveyed instrument coordinate"
  },
  "station-text": {
   "title": "Text extraction of the BGS station page",
   "url": "https://geomag.bgs.ac.uk/operations/greenwich.html",
   "sha256": "a60cd7c137bfe3dca4936e91c5a597aecd80dc19d8a750c00198af544ed28da5",
   "retrieved_at": "2026-10-07",
   "license": "BGS/UKRI public factual metadata",
   "locator": "Statistics: Geographic Coordinates"
  },
  "bridge": {
   "title": "OpenStreetMap, Westminster Bridge",
   "url": "https://nominatim.openstreetmap.org/search?q=Westminster+Bridge+London&format=json&limit=1",
   "sha256": "f8e72817aee1796d7e789992cdca70869fae09898acfa05bebb53302d0fdc1c4",
   "retrieved_at": "2026-10-07",
   "license": "ODbL 1.0, © OpenStreetMap contributors",
   "locator": "Bridge relation 19306462; distance reference only, not Monet’s exact easel position"
  },
  "image-rights": {
   "title": "Wikimedia Commons: image identity and PD-Art declaration",
   "url": "https://commons.wikimedia.org/wiki/File:Monet_The_Thames_at_Westminster_1871_Westminster.jpg",
   "sha256": "5f0f5238c54b1e85a2bcbc0c56124845ca1c95d52fbb3c39acd678012d945edc",
   "retrieved_at": "2026-10-07",
   "license": "Commons metadata CC BY-SA; work and faithful reproduction declared public domain",
   "locator": "NG6399; Monet died 1926; PD-Art / Public Domain Mark"
  },
  "image": {
   "title": "Claude Monet, The Thames below Westminster, NG6399",
   "url": "https://upload.wikimedia.org/wikipedia/commons/4/46/Monet_The_Thames_at_Westminster_1871_Westminster.jpg",
   "sha256": "9c11fb708a97742365e41079311b2a99d931246815cc93c8b00d79275e7eb04e",
   "retrieved_at": "2026-10-07",
   "license": "Public domain, PD-Art, per cached Wikimedia Commons file page",
   "locator": "3000 × 1929 reproduction; lower-right inscription read as Claude Monet 71"
  }
 }
}