http://walter.bislins.ch/bloge/index.asp?page=Flat%2DEarth%3A+Finding+the+curvature+of+the+Earth#H_Curvature_App.3A_Simulation_of_Globe-Earth_and_Flat-Earth


settings:

CurveApp = {
  "DemoText": "",
  "Description": "",
  "Height": 11887.2,
  "FocalLengthField": 21,
  "Roll": 0,
  "Nick": 0,
  "Pan": 0,
  "nLines": 45,
  "showModel": 2,
  "showGrid": 1,
  "showData": false,
  "showTangent": false,
  "showEyeLevel": true,
  "deviceRatio": 1.5,
  "viewcenterHorizon": 0,
  "ObjType": [
    3,
    3
  ],
  "NObjects": [
    0,
    0
  ],
  "ObjDist": [
    500,
    600
  ],
  "ObjDeltaDist": [
    300,
    300
  ],
  "ObjSideType": [
    0,
    0
  ],
  "ObjSidePos": [
    0,
    0
  ],
  "ObjSideVar": [
    0,
    0
  ],
  "ObjSizeType": [
    0,
    0
  ],
  "ObjSize": [
    65,
    100
  ],
  "ObjSizeVar": [
    0,
    0
  ],
  "refractionCoeff": 0,
  "tempGradient": -0.0343,
  "refractionSync": 1,
  "pressure": 196.77347,
  "temperatureC": -56.5,
  "refractionFactMin": 0.5,
  "refractionFactMax": 10000,
  "rEarth": 6371000,
  "rFEarth": 10007543
}