{
  "$schema": "./document.schema.json",
  "schemaVersion": "2.0-draft",
  "status": "authored-draft",
  "id": "nearby-worlds",
  "title": "Nearby Worlds",
  "language": "en-GB",
  "description": "Five planets explored through unfamiliar clocks, sizes and paths; twenty independent passages from CC0 facts.",
  "playbackPolicy": {
    "layoutOwner": "player",
    "axes": [
      "topic",
      "passage-within-topic"
    ],
    "rangeDegrees": [
      0,
      360
    ],
    "circular": true,
    "allocation": "random-with-spacing-on-edition-load",
    "stableFor": "loaded-edition-session",
    "reallocateOnPowerToggle": false,
    "receptionGaps": "required-between-stations-on-both-axes",
    "maxAudiblePassages": 1
  },
  "topics": [
    {
      "id": "mercury",
      "title": "Quick Orbit, Slow Turn",
      "sourceIds": [
        "wikidata-q308"
      ],
      "passages": [
        {
          "id": "mercury-year",
          "title": "Eighty-eight days",
          "text": "Mercury completes an orbit of the Sun in about eighty-eight Earth days. Imagine counting a year with that journey instead of Earth's. A birthday calendar would turn its pages much faster, although the person keeping it would not be ageing any faster."
        },
        {
          "id": "mercury-rotation",
          "title": "A slow turn",
          "text": "Mercury takes about fifty-nine Earth days to rotate once relative to the distant stars. Its orbit lasts about eighty-eight days. Rotation and revolution are different clocks, running together on the same world without agreeing on how long a complete cycle should take."
        },
        {
          "id": "mercury-size",
          "title": "A smaller globe",
          "text": "Mercury is roughly forty-nine hundred kilometres across. On a model where one centimetre stands for a thousand kilometres, the planet would span just under five centimetres. A world becomes easier to picture when its scale is briefly brought into the space between your fingers."
        },
        {
          "id": "mercury-orbit",
          "title": "Away from a circle",
          "text": "Mercury's orbital eccentricity is about zero point two one. Zero would describe a circle; this larger value describes a more stretched ellipse. A single number gives a clue to the shape of a journey, without drawing the path itself."
        }
      ]
    },
    {
      "id": "venus",
      "title": "Unfamiliar Clocks",
      "sourceIds": [
        "wikidata-q313"
      ],
      "passages": [
        {
          "id": "venus-year",
          "title": "A shorter calendar",
          "text": "Venus takes about two hundred and twenty-five Earth days to orbit the Sun. Imagine a calendar whose year ends after that interval. The same stretch of your life could contain a different number of years, depending on which planet supplies the clock."
        },
        {
          "id": "venus-rotation",
          "title": "Longer than a year",
          "text": "Venus takes about two hundred and forty-three Earth days to rotate once relative to the stars, longer than its orbit around the Sun. A full turn and a full year trade their familiar order. This rotation period is not the interval from one sunrise to the next."
        },
        {
          "id": "venus-size",
          "title": "A globe in the hand",
          "text": "Venus measures about twelve thousand one hundred kilometres across its equator. At one centimetre per thousand kilometres, a model would be a little over twelve centimetres wide. A number too large for an ordinary room becomes something that could rest in your hands."
        },
        {
          "id": "venus-orbit",
          "title": "Almost a circle",
          "text": "Venus has an orbital eccentricity of about zero point zero zero seven. With zero representing a circle, that value describes an orbit quite close to circular. The difference is real, yet small enough that an ordinary sketch might hide it."
        }
      ]
    },
    {
      "id": "earth",
      "title": "The Familiar Becomes Strange",
      "sourceIds": [
        "wikidata-q2"
      ],
      "passages": [
        {
          "id": "earth-year",
          "title": "The extra fraction",
          "text": "Earth completes an orbit relative to the stars in about three hundred and sixty-five and a quarter days. That fraction is easy to overlook when imagining a year as a whole number. The planet's motion does not wait for our counting system to reach a tidy boundary."
        },
        {
          "id": "earth-rotation",
          "title": "Which clock?",
          "text": "Earth's rotation relative to distant stars takes about twenty-three hours and fifty-six minutes. The familiar mean solar day lasts twenty-four hours. A day's duration depends on what is being watched: the stars and the Sun supply slightly different reference points for counting a turn."
        },
        {
          "id": "earth-size",
          "title": "A scale for home",
          "text": "Earth's mean diameter is about twelve thousand seven hundred kilometres. On a model with a thousand kilometres represented by one centimetre, home would be less than thirteen centimetres wide. A place containing every familiar journey can become a small object in an imagined collection."
        },
        {
          "id": "earth-surface",
          "title": "A vast exterior",
          "text": "Earth's total surface area is about five hundred and ten million square kilometres. Dividing that figure into a million equal imaginary patches would give each patch roughly five hundred and ten square kilometres. Even a tiny fraction of a planet can remain difficult to picture."
        }
      ]
    },
    {
      "id": "mars",
      "title": "A Different Pace",
      "sourceIds": [
        "wikidata-q111"
      ],
      "passages": [
        {
          "id": "mars-year",
          "title": "Six hundred and eighty-seven",
          "text": "Mars needs about six hundred and eighty-seven Earth days to circle the Sun. Imagine waiting that long between one annual celebration and the next. The event is still yearly by its own calendar, while an Earth observer counts a considerably longer interval."
        },
        {
          "id": "mars-rotation",
          "title": "Nearly familiar",
          "text": "Mars rotates once relative to the stars in about twenty-four hours and thirty-seven minutes. That sounds close to an Earth day, yet the small difference would accumulate across repeated turns. Two clocks can seem almost in agreement while slowly drifting far apart."
        },
        {
          "id": "mars-surface",
          "title": "An imagined division",
          "text": "Mars has a surface area of roughly one hundred and forty-five million square kilometres. Divide it into a million imaginary pieces and each still covers about one hundred and forty-five square kilometres. A planetary number remains large even after being divided a million ways."
        },
        {
          "id": "mars-orbit",
          "title": "An oval journey",
          "text": "Mars has an orbital eccentricity of about zero point zero nine. Its path is an ellipse rather than a perfect circle. The number describes shape, not how quickly the planet moves; a catalogue can place different kinds of measurements side by side without making them equivalent."
        }
      ]
    },
    {
      "id": "jupiter",
      "title": "A Different Scale",
      "sourceIds": [
        "wikidata-q319"
      ],
      "passages": [
        {
          "id": "jupiter-year",
          "title": "A long return",
          "text": "Jupiter takes about four thousand three hundred and thirty-three Earth days to complete an orbit. Imagine marking the same point on its path and waiting for its return. A single planetary year can hold a substantial stretch of an ordinary human life."
        },
        {
          "id": "jupiter-rotation",
          "title": "A quick turn",
          "text": "Jupiter's listed rotation period is roughly ten hours. In the time a familiar clock completes one twenty-four-hour cycle, this world can rotate more than twice. The relationship between the size of a world and the length of its turn need not match an everyday intuition."
        },
        {
          "id": "jupiter-size",
          "title": "Too large for the shelf",
          "text": "Jupiter spans roughly one hundred and forty-three thousand kilometres across its equator. At a scale of one centimetre per thousand kilometres, its model would be about a metre and forty-three centimetres wide. An imagined tabletop collection suddenly needs a much larger room."
        },
        {
          "id": "jupiter-unit",
          "title": "Becoming a measure",
          "text": "Jupiter's mass can be expressed as one Jupiter mass. The planet has become a reference for describing other objects. It is an intriguing change of role: something first measured by comparison can itself become the unit that makes later comparisons easier."
        }
      ]
    }
  ],
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    "rightsLimitations": "CC0 applies to the cited structured data, not to images, recordings, linked websites or discussion pages. None of those assets are included. The source designation does not relicense REVOUAR software or branding.",
    "endorsement": "An independent REVOUAR presentation; no affiliation or endorsement by Wikidata or the Wikimedia Foundation is implied.",
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