projectionrotate

<!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>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    	.style ("background", "lightblue");

projection = d3.geoStereographic();
    projection.rotate([0,180,70])
    
 		continents = svg.append ("path");   
 
    path = d3.geoPath(projection);

// https://bit.ly/2smBkF7
    d3.json ("https://rawgit.com/visionscarto/some-geo-data/master/ne_110m_admin_0_countries/countries.geojson", function (err, json){  
      continents.datum(json) ;
    	//svg.append("path") .attr("d", path(json));
    });
    
    // d3.json ("https://rawgit.com/visionscarto/some-geo-data/master/ne_110m_admin_0_countries/countries.geojson", function (err, json){  
//    continents.selectAll ("path")
//    .data(json.features)
//    .enter()
//    .append('path')
//    .style('fill',(d,i) => d.properties.name.match(/a/) ? 'red' :'blue');
//    });
    
    d3.timer(function(elapsed){
             //projection.rotate([elapsed/100,0,0]);
      			 projection.scale(elapsed/10);
      			 continents.attr("d", path);
    })
    
    svg.append("text")
    	.text(projection([0,0]))
   
      .attr("y", 20)
      .attr("x", 12)
      .attr("font-size", 79)
      .attr("font-type", "monospace");

</script>
</body>

https://d3js.org/d3.v4.min.js