import “../math/trigonometry”;

function d3_geo_spherical(cartesian) {

return [
  Math.atan2(cartesian[1], cartesian[0]),
  d3_asin(cartesian[2])
];

}

function d3_geo_sphericalEqual(a, b) {

return Math.abs(a[0] - b[0]) < ε && Math.abs(a[1] - b[1]) < ε;

}