/**
* Set locality.
*
* @param Locality $Locality Locality
* @return \Jyotish\Base\Data
*/
public function setLocality(Locality $Locality)
{
if (!is_null($Locality)) {
$this->clearData();
}
$this->Locality = $Locality;
$this->data[self::BLOCK_USER]['longitude'] = $this->Locality->getLongitude();
$this->data[self::BLOCK_USER]['latitude'] = $this->Locality->getLatitude();
$this->data[self::BLOCK_USER]['altitude'] = $this->Locality->getAltitude();
return $this;
}
/**
* Get Local Sidereal Time.
*
* @param DateTime $DateTime Date
* @param Locality $Locality Locality
* @return float In hours
*/
public static function getLST(DateTime $DateTime, Locality $Locality)
{
$hour = $DateTime->format('G');
$minute = $DateTime->format('i');
$second = $DateTime->format('s');
$jc = Time::getJC($DateTime);
$gst = 24110.54841 + 8640184.812866 * $jc + 0.09310400000000001 * $jc ** 2 - 6.2E-6 * $jc ** 3;
$units = Math::partsToUnits($gst, 86400);
$hourS0 = $units['parts'] / 3600;
$hourLng = $Locality->getLongitude() / 15;
$hourOffset = $DateTime->getOffset() / 3600;
$hourUT = $hour + $minute / 60 + $second / 3600 - $hourOffset;
$lst = $hourS0 + $hourLng + $hourUT * 1.002737909350795;
$result = $lst >= 24 ? $lst -= 24 : $lst;
return $result;
}
