/*!
 * satellite-js v5.0.0
 * (c) 2013 Shashwat Kandadai and UCSC
 * https://github.com/shashwatak/satellite-js
 * License: MIT
 */

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = gstime;
var _constants = require("../constants");
var _ext = require("../ext");
/* -----------------------------------------------------------------------------
 *
 *                           function gstime
 *
 *  this function finds the greenwich sidereal time.
 *
 *  author        : david vallado                  719-573-2600    1 mar 2001
 *
 *  inputs          description                    range / units
 *    jdut1       - julian date in ut1             days from 4713 bc
 *
 *  outputs       :
 *    gstime      - greenwich sidereal time        0 to 2pi rad
 *
 *  locals        :
 *    temp        - temporary variable for doubles   rad
 *    tut1        - julian centuries from the
 *                  jan 1, 2000 12 h epoch (ut1)
 *
 *  coupling      :
 *    none
 *
 *  references    :
 *    vallado       2004, 191, eq 3-45
 * --------------------------------------------------------------------------- */
function gstimeInternal(jdut1) {
  var tut1 = (jdut1 - 2451545.0) / 36525.0;
  var temp = -6.2e-6 * tut1 * tut1 * tut1 + 0.093104 * tut1 * tut1 + (876600.0 * 3600 + 8640184.812866) * tut1 + 67310.54841; // # sec
  temp = temp * _constants.deg2rad / 240.0 % _constants.twoPi; // 360/86400 = 1/240, to deg, to rad

  //  ------------------------ check quadrants ---------------------
  if (temp < 0.0) {
    temp += _constants.twoPi;
  }
  return temp;
}
function gstime() {
  if ((arguments.length <= 0 ? undefined : arguments[0]) instanceof Date || arguments.length > 1) {
    return gstimeInternal(_ext.jday.apply(void 0, arguments));
  }
  return gstimeInternal.apply(void 0, arguments);
}