Solar.fromJulianDay constructor

Solar.fromJulianDay(double julianDay)

Implementation

Solar.fromJulianDay(double julianDay) {
  int d = (julianDay + 0.5).floor();
  double f = julianDay + 0.5 - d;
  int c;

  if (d >= 2299161) {
    c = ((d - 1867216.25) / 36524.25).floor();
    d += 1 + c - (c * 1.0 / 4).floor();
  }
  d += 1524;
  int year = ((d - 122.1) / 365.25).floor();
  d -= (365.25 * year).floor();
  int month = (d * 1.0 / 30.601).floor();
  d -= (30.601 * month).floor();
  int day = d;
  if (month > 13) {
    month -= 13;
    year -= 4715;
  } else {
    month -= 1;
    year -= 4716;
  }
  f *= 24;
  int hour = f.floor();

  f -= hour;
  f *= 60;
  int minute = f.floor();

  f -= minute;
  f *= 60;
  int second = f.round();

  if (second > 59) {
    second -= 60;
    minute++;
  }
  if (minute > 59) {
    minute -= 60;
    hour++;
  }
  if (hour > 23) {
    hour -= 24;
    day += 1;
  }

  _year = year;
  _month = month;
  _day = day;
  _hour = hour;
  _minute = minute;
  _second = second;
}