{
  "type": "quote",
  "site": {
    "name": "Leafy Quotes",
    "language": "en",
    "url": "https://www.leafyquotes.com"
  },
  "formats": "Every page has two versions with the same data: JSON (the page address + .json) and markdown (the page address + .md). Append .json or .md to any `url` in this document.",
  "url": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/when-navigators-determine",
  "json": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/when-navigators-determine.json",
  "markdown": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/when-navigators-determine.md",
  "id": "91c0e8e5-40fd-4191-9388-5c86e257306e",
  "slug": "when-navigators-determine",
  "text": "When navigators... determine a ... they must... calculate Paris time...[with] a chronometer set for Paris. The qualitative problem of simultaneity is made to depend upon the quantitative problem of the measurement of time.",
  "language": "en",
  "author": {
    "name": "Henri Poincaré",
    "slug": "henri-poincare",
    "url": "https://www.leafyquotes.com/henri-poincare"
  },
  "book": {
    "title": "The Value of Science",
    "slug": "the-value-of-science",
    "url": "https://www.leafyquotes.com/henri-poincare/the-value-of-science"
  },
  "character": null,
  "chapter": null,
  "chapter_parent": null,
  "page": null,
  "verified": false,
  "original": null,
  "other_languages": [],
  "topics": [
    {
      "name": "time",
      "slug": "time",
      "url": "https://www.leafyquotes.com/topics/time"
    }
  ],
  "source": {
    "name": "Wikiquote",
    "url": "https://en.wikiquote.org/wiki/Henri_Poincar%C3%A9#Ch._2:_The_Measure_of_Time",
    "license": {
      "label": "CC BY-SA 4.0",
      "url": "https://creativecommons.org/licenses/by-sa/4.0/"
    }
  },
  "added_at": "2026-09-25T22:37:49",
  "more_from_book": [
    {
      "id": "f28edbd2-fdd1-4274-bad8-3e9fa504dc26",
      "slug": "time-and-space",
      "url": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/time-and-space",
      "text": "Time and Space … It is not nature which imposes them upon us, it is we who impose them upon nature because we find them convenient.",
      "language": "en",
      "character": null,
      "chapter": null,
      "chapter_parent": null,
      "page": null,
      "verified": false,
      "original": null,
      "other_languages": [],
      "topics": [
        {
          "name": "time",
          "slug": "time",
          "url": "https://www.leafyquotes.com/topics/time"
        }
      ],
      "source": {
        "name": "Wikiquote",
        "url": "https://en.wikiquote.org/wiki/Henri_Poincar%C3%A9#Introduction",
        "license": {
          "label": "CC BY-SA 4.0",
          "url": "https://creativecommons.org/licenses/by-sa/4.0/"
        }
      },
      "added_at": "2026-09-26T07:49:02"
    },
    {
      "id": "c0aeb15f-66f1-4acf-b0b9-25fca02555bc",
      "slug": "the-advance-of-science",
      "url": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/the-advance-of-science",
      "text": "The advance of science is not comparable to the changes of a city, where old edifices are pitilessly torn down to give place to new, but to the continuous evolution of zoologic types which develop ceaselessly and end by becoming unrecognizable to the common sight, but where an expert eye finds always traces of the prior work of the centuries past. One must not think then that the old-fashioned theories have been sterile or vain.",
      "language": "en",
      "character": null,
      "chapter": null,
      "chapter_parent": null,
      "page": null,
      "verified": false,
      "original": null,
      "other_languages": [],
      "topics": [
        {
          "name": "science",
          "slug": "science",
          "url": "https://www.leafyquotes.com/topics/science"
        }
      ],
      "source": {
        "name": "Wikiquote",
        "url": "https://en.wikiquote.org/wiki/Henri_Poincar%C3%A9#Introduction",
        "license": {
          "label": "CC BY-SA 4.0",
          "url": "https://creativecommons.org/licenses/by-sa/4.0/"
        }
      },
      "added_at": "2026-09-26T07:49:02"
    },
    {
      "id": "315e697c-6806-45a2-9520-7e4b5b0e169e",
      "slug": "for-an-aggregate",
      "url": "https://www.leafyquotes.com/henri-poincare/the-value-of-science/for-an-aggregate",
      "text": "For an aggregate of sensations to have become a remembrance capable of classification in time, it must have ceased to be actual, we must have lost the sense of its infinite complexity, otherwise it would have remained present. It must, so to speak, have crystallized around a center of associations of ideas which will be a sort of label. It is only when they have lost all life that we can classify our memories in time as a botanist arranges dried flowers in his herbarium.",
      "language": "en",
      "character": null,
      "chapter": null,
      "chapter_parent": null,
      "page": null,
      "verified": false,
      "original": null,
      "other_languages": [],
      "topics": [
        {
          "name": "memory",
          "slug": "memory",
          "url": "https://www.leafyquotes.com/topics/memory"
        }
      ],
      "source": {
        "name": "Wikiquote",
        "url": "https://en.wikiquote.org/wiki/Henri_Poincar%C3%A9#Ch._2:_The_Measure_of_Time",
        "license": {
          "label": "CC BY-SA 4.0",
          "url": "https://creativecommons.org/licenses/by-sa/4.0/"
        }
      },
      "added_at": "2026-09-26T07:49:02"
    }
  ]
}