text: import "azimuthal";
  import "geo";
  import "projection";
  
  var d3_geo_orthographic = d3_geo_azimuthal(
    function() { return 1; },
    Math.asin
  );
  
  (d3.geo.orthographic = function() {
    return d3_geo_projection(d3_geo_orthographic);
  }).raw = d3_geo_orthographic;
  