D3 Examples - Hello missile world

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Yeah - Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 1000)
      .attr("height", 500)
​
    //projection = d3.geoOrthographic() 
    
    projection = d3.geoAzimuthalEquidistant()
    .rotate([180,-30])
    .fitExtent([[0,0],[600,500]], {type:"Sphere"});
    
    svg.append("path")
    .datum({type:"Sphere"})
    .attr("fill","lightblue")
​
    path = d3.geoPath(projection);
    
    land = svg.append("path")
        
    line = {type:"LineString",
    coordinates:[[-150,0],[0,0]]
    }
    
    svg.append("path")
        .datum(line)
            .attr("d",path)
        .attr("stroke", "red")
        .attr("fill","none")       
    
    svg.append("path")
    .attr("fill","yellow")
    .datum({
      type:"Multipoint", 
      coordinates:[[125.8,39]]})
    
    d3.json("https://visionscarto.net/bxl/countries.geojson", function(err,json)
            {land.datum(json);render()
    })    
   
    svg.append("text")
      .text(projection([0,0]))
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 18)
      .attr("font-family", "monospace")
    
    function render(){
      svg.selectAll("path")
      .attr("d", path)
    }
    
    d3.timer(function(e){projection.rotate([e/10,-30]);render()})
​
  </script>
</body>
​
    