public function toJD($scale = null)
    {
        if ($scale) {
            return bcadd((string)$this->jd, (string)$this->dayFrac, $scale);
        } else {
            return $this->jd + $this->dayFrac;
        }
    }
public function toJD($scale = null)
    {
        if ($scale) {
            return bcadd((string)$this->jd, (string)$this->dayFrac, $scale);
        } else {
            return $this->jd + $this->dayFrac;
        }
    }
Returns a Julian date representation of this instance.

@param  int $scale Optional additional decimal precision

@return float|string