/**
* Get approximate ayanamsha value.
*
* @param null|DateTime $Date Date (optional)
* @param string $ayanamsha Ayanamsha name (optional)
* @return float
*/
public static function getAyanamsha(DateTime $Date = null, $ayanamsha = self::AYANAMSHA_LAHIRI)
{
if (is_null($Date)) {
$Date = new DateTime('now');
}
$TimeZone = $Date->getTimezone();
$yearMatching = sprintf('%04d', abs(self::$coincidence[$ayanamsha]));
$eraMatching = strval(self::$coincidence[$ayanamsha])[0] == '-' ? '-' : '';
$dateMatching = $eraMatching . $yearMatching . '-01-01';
$DateMatching = new DateTime($dateMatching, $TimeZone);
$Interval = $DateMatching->diff($Date);
$factor = $Interval->days / Astro::DURATION_YEAR_GREGORIAN;
$ayanamshaValue = Math::dmsToDecimal(['d' => 0, 'm' => 0, 's' => Astro::getPrecessionSpeed()]) * $factor;
return $ayanamshaValue;
}
/**
* Get Nakshatra. Ending Moment of asterism of the day, that is, the stellar
* mansion in which graha is located for an observer at the center of the Earth.
*
* @param bool $withLimit Time limit
* @param bool $withAbhijit Take into account the Abhijit nakshatra
* @param string $grahaKey Graha key (default: Ch)
* @return array
*/
public function getNakshatra($withLimit = false, $withAbhijit = false, $grahaKey = Graha::KEY_CH)
{
$this->checkData(__FUNCTION__);
$unit = 360 / 27;
if (array_key_exists($grahaKey, Graha::$graha)) {
$lngGraha = $this->getData()['graha'][$grahaKey]['longitude'];
} else {
if (!isset($this->getData()['lagna'][$grahaKey]['longitude'])) {
throw new Exception\InvalidArgumentException("Longitude value for the key '{$grahaKey}' is not defined.");
} else {
$lngGraha = $this->getData()['lagna'][$grahaKey]['longitude'];
}
}
$nakshatraUnits = Math::partsToUnits($lngGraha, $unit);
$nakshatra = [];
$nakshatra['anga'] = Panchanga::ANGA_NAKSHATRA;
if ($withAbhijit) {
if ($nakshatraUnits['units'] == 21 || $nakshatraUnits['units'] == 22) {
$Abhijit = Nakshatra::getInstance(28);
$abhijitStart = Math::dmsToDecimal($Abhijit->nakshatraStart);
$abhijitEnd = Math::dmsToDecimal($Abhijit->nakshatraEnd);
if ($lngGraha < $abhijitStart) {
$nakshatra['key'] = 21;
$N = Nakshatra::getInstance($nakshatra['key']);
$nStart = Math::dmsToDecimal($N->nakshatraStart);
$unit = $abhijitStart - $nStart;
$left = $abhijitStart - $lngGraha;
} elseif ($lngGraha >= $abhijitStart && $lngGraha < $abhijitEnd) {
$nakshatra['key'] = 28;
$unit = $abhijitEnd - $abhijitStart;
$left = $abhijitEnd - $lngGraha;
} else {
$nakshatra['key'] = 22;
$N = Nakshatra::getInstance($nakshatra['key']);
$nEnd = Math::dmsToDecimal($N->nakshatraEnd);
$unit = $nEnd - $abhijitEnd;
$left = $nEnd - $lngGraha;
}
$nakshatra['ratio'] = $unit / Math::dmsToDecimal(Nakshatra::$arc);
} else {
$nakshatra['key'] = $nakshatraUnits['units'];
$nakshatra['ratio'] = 1;
$left = $unit - $nakshatraUnits['parts'];
}
$nakshatra['abhijit'] = true;
} else {
$nakshatra['key'] = $nakshatraUnits['units'];
$nakshatra['ratio'] = 1;
$nakshatra['abhijit'] = false;
$left = $unit - $nakshatraUnits['parts'];
}
$nakshatra['left'] = $left * 100 / $unit;
$nakshatra['name'] = Nakshatra::$nakshatra[$nakshatra['key']];
if ($nakshatra['left'] < 100 && $nakshatra['left'] >= 75) {
$nakshatra['pada'] = 1;
} elseif ($nakshatra['left'] < 75 && $nakshatra['left'] >= 50) {
$nakshatra['pada'] = 2;
} elseif ($nakshatra['left'] < 50 && $nakshatra['left'] >= 25) {
$nakshatra['pada'] = 3;
} else {
$nakshatra['pada'] = 4;
}
if ($withLimit) {
$this->AngaDefiner = clone $this;
$limit = $this->getAngaLimit($nakshatra);
$nakshatra['end'] = $limit;
$this->AngaDefiner = null;
}
return $nakshatra;
}
/**
* Determine if the graha is in pushkara bhaga or pushkara navamsha. Indicate
* when to pushkara bhaga remains less than 1 degree.
*
* @return bool|int|float Distance to pushkara bhaga
* @see Vaidyanatha Dikshita. Jataka Parijata. Chapter 1, Verse 58.
*/
public function isPushkara($type = Graha::PUSHKARA_NAVAMSHA)
{
$rashiGraha = $this->getEnvironment()['graha'][$this->objectKey]['rashi'];
$degGraha = $this->getEnvironment()['graha'][$this->objectKey]['degree'];
$valNavamsha = Math::dmsToDecimal(['d' => 3, 'm' => 20]);
switch ($type) {
case Graha::PUSHKARA_BHAGA:
$degPushkara = Rashi::$pushkaraBhaga[$rashiGraha];
$distanceGraha = abs($degGraha - $degPushkara);
if ($distanceGraha < 1) {
return $distanceGraha;
} else {
return false;
}
break;
case Graha::PUSHKARA_NAVAMSHA:
default:
$numNavamsha = null;
$degNavamsha = [];
for ($i = 0; $i <= 1; $i++) {
$degNavamsha['start'] = (Rashi::$pushkaraNavamsha[$rashiGraha][$i] - 1) * $valNavamsha;
$degNavamsha['end'] = $degNavamsha['start'] + $valNavamsha;
if ($degGraha >= $degNavamsha['start'] && $degGraha < $degNavamsha['end']) {
$numNavamsha = Rashi::$pushkaraNavamsha[$rashiGraha][$i];
break;
}
}
if (!is_null($numNavamsha)) {
$number = ($rashiGraha - 1) * 9 + $numNavamsha;
$navamsha = Math::numberInCycle(1, $number);
return $navamsha;
} else {
return false;
}
}
}
/**
* Get obliquity of the ecliptic.
*
* @param null|DateTime $DateTime Date (optional)
* @return float In degree
*/
public static function getEclipticObliquity(DateTime $DateTime = null)
{
$jc = Time::getJC($DateTime);
$k = Math::dmsToDecimal(['d' => 23, 'm' => 26, 's' => 21.448]);
$k1 = Math::dmsToDecimal(['d' => 0, 'm' => 0, 's' => 46.815]);
$k2 = Math::dmsToDecimal(['d' => 0, 'm' => 0, 's' => 0.00059]);
$k3 = Math::dmsToDecimal(['d' => 0, 'm' => 0, 's' => 0.001813]);
$e = $k - $k1 * $jc - $k2 * $jc ** 2 + $k3 * $jc ** 3;
return $e;
}
/**
* Get converting value of angle.
*
* @param string $value
* @param bool $isLongitude
* @return float
*/
private function getAngle($value, $isLongitude = false)
{
$valueArray = $this->convertValue($value);
$decimal = Math::dmsToDecimal($valueArray);
if ($isLongitude) {
$decimal *= -1;
}
return $decimal;
}
