{
  "about": "Worked numbers for the dayground, computed by dayground.js. Each vector gives its inputs and what the engine returns for them. Times are local minutes since midnight; positions are pixels from the top-left corner, y down.",
  "spec": "https://solstone.app/brand/dayground.md",
  "module": "https://solstone.app/brand/dayground/dayground.js",
  "values": {
    "--sunarc-ground-light-day": "#FEFCF8",
    "--sunarc-arc-angle": "36deg",
    "--sunarc-bow-ratio": "0.07919",
    "--sunarc-diameter-ratio": "1.6180339887",
    "--sunarc-overshoot": "1",
    "--sunarc-envelope-edge": "0.22",
    "--sunarc-peak-opacity": "0.55",
    "--sunarc-peak-opacity-dark": "0.20",
    "--sunarc-twilight-minutes": "30",
    "--sunarc-ground-light-night": "#AEA393",
    "--sunarc-ground-light-deep": "#8C806E",
    "--sunarc-ground-dark-day": "#392E26",
    "--sunarc-ground-dark-night": "#2E241C",
    "--sunarc-ground-dark-deep": "#281E17",
    "--sunarc-glow-color": "#FFCC33",
    "--sunarc-glow-radius-ratio": "1.6180339887",
    "--sunarc-glow-day-alpha": "0.22",
    "--sunarc-glow-mid-stop": "38%",
    "--sunarc-glow-mid-ratio": "0.45",
    "--sunarc-twilight-radius-ratio": "2.6180339887",
    "--sunarc-twilight-alpha-dark": "0.62",
    "--sunarc-twilight-alpha-light": "0.95",
    "--sunarc-twilight-sink": "0.10",
    "--sunarc-true-dark-min": "180",
    "--sunarc-sunrise": "#FFF3CF",
    "--orange": "#E8913A"
  },
  "geometry": [
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.5
      },
      "expect": {
        "side": 393,
        "diameter": 635.887358,
        "R": 317.943679,
        "A": [
          -224.820131,
          -224.820131
        ],
        "B": [
          617.820131,
          1076.820131
        ],
        "chord": 1550.583756,
        "sagitta": 122.790728,
        "arcRadius": 2508.964117,
        "centre": [
          -1806.57745,
          1722.728257
        ],
        "subtendedDeg": 35.999007,
        "position": [
          299.576892,
          359.271318
        ],
        "haloRadius": 514.443679,
        "twilightRadius": 832.387358
      }
    },
    {
      "frame": "tablet",
      "input": {
        "width": 1180,
        "height": 820,
        "t": 0.5
      },
      "expect": {
        "side": 820,
        "diameter": 1326.787871,
        "R": 663.393935,
        "A": [
          -469.09035,
          -469.09035
        ],
        "B": [
          1649.09035,
          1289.09035
        ],
        "chord": 2752.796552,
        "sagitta": 217.993959,
        "arcRadius": 4454.237149,
        "centre": [
          -2115.641655,
          3669.641023
        ],
        "subtendedDeg": 35.999007,
        "position": [
          729.23033,
          242.26127
        ],
        "haloRadius": 1073.393935,
        "twilightRadius": 1736.787871
      }
    },
    {
      "frame": "web",
      "input": {
        "width": 1280,
        "height": 820,
        "t": 0.5
      },
      "expect": {
        "side": 820,
        "diameter": 1326.787871,
        "R": 663.393935,
        "A": [
          -469.09035,
          -469.09035
        ],
        "B": [
          1749.09035,
          1289.09035
        ],
        "chord": 2830.463742,
        "sagitta": 224.144424,
        "arcRadius": 4579.908653,
        "centre": [
          -2065.641655,
          3823.529736
        ],
        "subtendedDeg": 35.999007,
        "position": [
          779.23033,
          234.34227
        ],
        "haloRadius": 1073.393935,
        "twilightRadius": 1736.787871
      }
    },
    {
      "frame": "watch",
      "input": {
        "width": 416,
        "height": 496,
        "t": 0.5
      },
      "expect": {
        "side": 416,
        "diameter": 673.102139,
        "R": 336.55107,
        "A": [
          -237.977544,
          -237.977544
        ],
        "B": [
          653.977544,
          733.977544
        ],
        "chord": 1319.196941,
        "sagitta": 104.467206,
        "arcRadius": 2134.562402,
        "centre": [
          -1287.729176,
          1620.618206
        ],
        "subtendedDeg": 35.999007,
        "position": [
          284.969123,
          177.366077
        ],
        "haloRadius": 544.55107,
        "twilightRadius": 881.102139
      }
    }
  ],
  "path": [
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0
      },
      "expect": {
        "position": [
          -224.820131,
          -224.820131
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.1
      },
      "expect": {
        "position": [
          -105.656989,
          -121.660673
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.25
      },
      "expect": {
        "position": [
          60.362241,
          46.590694
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.5
      },
      "expect": {
        "position": [
          299.576892,
          359.271318
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.75
      },
      "expect": {
        "position": [
          486.933888,
          705.522928
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 0.9
      },
      "expect": {
        "position": [
          572.48061,
          925.869622
        ]
      }
    },
    {
      "frame": "phone",
      "input": {
        "width": 393,
        "height": 852,
        "t": 1
      },
      "expect": {
        "position": [
          617.820131,
          1076.820131
        ]
      }
    }
  ],
  "sunTimes": [
    {
      "input": {
        "zone": "America/Denver",
        "lat": 39.74,
        "lon": -104.98,
        "date": "2026-09-19",
        "utcOffsetHours": -6
      },
      "expect": {
        "rise": 404.494293,
        "set": 1142.234085,
        "riseClock": "06:44",
        "setClock": "19:02"
      }
    },
    {
      "input": {
        "zone": "America/Denver",
        "lat": 39.74,
        "lon": -104.98,
        "date": "2026-09-23",
        "utcOffsetHours": -6
      },
      "expect": {
        "rise": 408.259911,
        "set": 1135.648496,
        "riseClock": "06:48",
        "setClock": "18:56"
      }
    },
    {
      "input": {
        "zone": "Atlantic/Reykjavik",
        "lat": 64.15,
        "lon": -21.85,
        "date": "2026-06-21",
        "utcOffsetHours": 0
      },
      "expect": {
        "rise": 174.488788,
        "set": 1443.701439,
        "riseClock": "02:54",
        "setClock": "00:04"
      }
    },
    {
      "input": {
        "zone": "Europe/London",
        "lat": 51.51,
        "lon": -0.13,
        "date": "2026-12-21",
        "utcOffsetHours": 0
      },
      "expect": {
        "rise": 483.648755,
        "set": 953.346263,
        "riseClock": "08:04",
        "setClock": "15:53"
      }
    },
    {
      "input": {
        "zone": "Australia/Sydney",
        "lat": -33.87,
        "lon": 151.22,
        "date": "2026-12-21",
        "utcOffsetHours": 11
      },
      "expect": {
        "rise": 340.531674,
        "set": 1205.280163,
        "riseClock": "05:41",
        "setClock": "20:05"
      }
    }
  ],
  "day": [
    {
      "input": {
        "date": "2026-09-19",
        "clock": "05:30",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": -0.055775,
        "night": 1,
        "env": 0
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "06:14",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": -0.00062,
        "night": 1,
        "env": 0
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "06:44",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.036987,
        "night": 0.016476,
        "env": 0.261025
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "08:00",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.132256,
        "night": 0,
        "env": 0.810089
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "10:00",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.282681,
        "night": 0,
        "env": 1
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "12:53",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.499543,
        "night": 0,
        "env": 1
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "15:00",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.658743,
        "night": 0,
        "env": 1
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "17:30",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.846774,
        "night": 0,
        "env": 0.888482
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "19:02",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.9621,
        "night": 0,
        "env": 0.267313
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "19:32",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 0.999707,
        "night": 0.992197,
        "env": 0.002095
      }
    },
    {
      "input": {
        "date": "2026-09-19",
        "clock": "22:00",
        "rise": 404.494293,
        "set": 1142.234085
      },
      "expect": {
        "t": 1.185231,
        "night": 1,
        "env": 0
      }
    }
  ],
  "frames": [
    {
      "input": {
        "date": "2026-09-23",
        "clock": "13:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#FEFCF8",
        "sunOpacity": 0.55,
        "sunPosition": [
          308.287077,
          372.821234
        ],
        "haloAlpha": 0.22,
        "w": 0,
        "phase": "day",
        "twilight": null
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "13:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#392E26",
        "sunOpacity": 0.2,
        "sunPosition": [
          308.287077,
          372.821234
        ],
        "haloAlpha": 0.22,
        "w": 0,
        "phase": "day",
        "twilight": null
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "18:56",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#FDFBF7",
        "sunOpacity": 0.144381,
        "sunPosition": [
          601.862094,
          1019.649384
        ],
        "haloAlpha": 0.057752,
        "w": 0.734377,
        "phase": "day",
        "twilight": {
          "position": [
            601.862094,
            1019.649384
          ],
          "radius": 832.387358,
          "alpha": 0.697658,
          "color": "#FFE295",
          "cornerAlpha": 0.372761
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "18:56",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#392E26",
        "sunOpacity": 0.052502,
        "sunPosition": [
          601.862094,
          1019.649384
        ],
        "haloAlpha": 0.057752,
        "w": 0.734377,
        "phase": "day",
        "twilight": {
          "position": [
            601.862094,
            1019.649384
          ],
          "radius": 832.387358,
          "alpha": 0.455314,
          "color": "#F9BA36",
          "cornerAlpha": 0.243276
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "19:41",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#AEA393",
        "sunOpacity": 0,
        "sunPosition": [
          617.820131,
          1076.820131
        ],
        "haloAlpha": 0,
        "w": 0.993676,
        "phase": "evening",
        "twilight": {
          "position": [
            620.436353,
            1086.721228
          ],
          "radius": 832.387358,
          "alpha": 0.943992,
          "color": "#FFE293",
          "cornerAlpha": 0.416131
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "19:41",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#2E241C",
        "sunOpacity": 0,
        "sunPosition": [
          617.820131,
          1076.820131
        ],
        "haloAlpha": 0,
        "w": 0.993676,
        "phase": "evening",
        "twilight": {
          "position": [
            620.436353,
            1086.721228
          ],
          "radius": 832.387358,
          "alpha": 0.616079,
          "color": "#F8B836",
          "cornerAlpha": 0.27158
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "22:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#9B8F7E",
        "sunOpacity": 0,
        "sunPosition": [
          617.820131,
          1076.820131
        ],
        "haloAlpha": 0,
        "w": 0.434138,
        "phase": "evening",
        "twilight": {
          "position": [
            642.279218,
            1176.8327
          ],
          "radius": 832.387358,
          "alpha": 0.412431,
          "color": "#FFDC7E",
          "cornerAlpha": 0.152095
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "22:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#2B2119",
        "sunOpacity": 0,
        "sunPosition": [
          617.820131,
          1076.820131
        ],
        "haloAlpha": 0,
        "w": 0.434138,
        "phase": "evening",
        "twilight": {
          "position": [
            642.279218,
            1176.8327
          ],
          "radius": 832.387358,
          "alpha": 0.269166,
          "color": "#F1A739",
          "cornerAlpha": 0.099262
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "01:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#8C806E",
        "sunOpacity": 0,
        "sunPosition": [
          -224.820131,
          -224.820131
        ],
        "haloAlpha": 0,
        "w": 0,
        "phase": "true dark",
        "twilight": null
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "01:00",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#281E17",
        "sunOpacity": 0,
        "sunPosition": [
          -224.820131,
          -224.820131
        ],
        "haloAlpha": 0,
        "w": 0,
        "phase": "true dark",
        "twilight": null
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "05:30",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#ACA191",
        "sunOpacity": 0,
        "sunPosition": [
          -224.820131,
          -224.820131
        ],
        "haloAlpha": 0,
        "w": 0.938094,
        "phase": "before dawn",
        "twilight": {
          "position": [
            -249.939788,
            -244.955694
          ],
          "radius": 832.387358,
          "alpha": 0.891189,
          "color": "#FFE08E",
          "cornerAlpha": 0.374883
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "05:30",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#2E241C",
        "sunOpacity": 0,
        "sunPosition": [
          -224.820131,
          -224.820131
        ],
        "haloAlpha": 0,
        "w": 0.938094,
        "phase": "before dawn",
        "twilight": {
          "position": [
            -249.939788,
            -244.955694
          ],
          "radius": 832.387358,
          "alpha": 0.581618,
          "color": "#F6B437",
          "cornerAlpha": 0.244661
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "06:48",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "light",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#FDFBF7",
        "sunOpacity": 0.145264,
        "sunPosition": [
          -179.052047,
          -186.738161
        ],
        "haloAlpha": 0.058105,
        "w": 0.733576,
        "phase": "day",
        "twilight": {
          "position": [
            -179.052047,
            -186.738161
          ],
          "radius": 832.387358,
          "alpha": 0.696897,
          "color": "#FFE295",
          "cornerAlpha": 0.383399
        }
      }
    },
    {
      "input": {
        "date": "2026-09-23",
        "clock": "06:48",
        "rise": 408.259911,
        "set": 1135.648496,
        "appearance": "dark",
        "width": 393,
        "height": 852
      },
      "expect": {
        "ground": "#392E26",
        "sunOpacity": 0.052823,
        "sunPosition": [
          -179.052047,
          -186.738161
        ],
        "haloAlpha": 0.058105,
        "w": 0.733576,
        "phase": "day",
        "twilight": {
          "position": [
            -179.052047,
            -186.738161
          ],
          "radius": 832.387358,
          "alpha": 0.454817,
          "color": "#F9BA36",
          "cornerAlpha": 0.250218
        }
      }
    }
  ],
  "nightSky": {
    "input": {
      "width": 393,
      "height": 852,
      "rise": 408.259911,
      "set": 1135.648496
    },
    "expect": {
      "solarMidnight": 51.954203,
      "solarMidnightClock": "00:52",
      "stars": 788,
      "firstStars": [
        {
          "x": -264.23303,
          "y": 330.579058,
          "level": 3
        },
        {
          "x": -705.079003,
          "y": -84.898566,
          "level": 2
        },
        {
          "x": -23.444968,
          "y": 66.210015,
          "level": 0
        }
      ],
      "meteors": [
        {
          "start": 44.367039,
          "duration": 1.19024,
          "beam": 2,
          "length": 110.325714
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