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add methods for 13.5 minute tzait and plag hamincha based on that zman #229

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add methods for 13.5 minute tzait and plag hamincha based on that zman #229

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35 changes: 35 additions & 0 deletions src/main/java/com/kosherjava/zmanim/ComplexZmanimCalendar.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2597,6 +2597,22 @@ public Date getBainHashmashosYereim2Point1Degrees() {
public Date getBainHasmashosYereim2Point1Degrees() {
return getBainHashmashosYereim2Point1Degrees();
}

/**
* This method returns the time for tzait hacochavim (nightfall) calculated according to the opinion of the
* Geonim. This is calculated as 13.5 zmaniyot minutes after elevated sunset. This is a very early zman, and it
* should not be used without halachic guidance! It certainly should not be used for ending Shabbat, even unintentionally!
*
* @return the <code>Date</code> of the time of <em>tzais</em>. If the calculation can't be computed such as
* northern and southern locations even south of the Arctic Circle and north of the Antarctic Circle where
* the sun may not reach low enough below the horizon for this calculation, a <code>null</code> will be
* returned. See detailed explanation on top of the {@link AstronomicalCalendar} documentation.
*/
private Date getTzaisGeonim13AndAHalfMinutesZmanis() {
long shaahZmanit = getTemporalHour(getElevationAdjustedSunrise(), getElevationAdjustedSunset());
long dakahZmanit = shaahZmanit / 60;
return getTimeOffset(getElevationAdjustedSunset(),(13 * dakahZmanit) + (dakahZmanit / 2));
}

/**
* This method returns the <em>tzais</em> (nightfall) based on the opinion of the <em>Geonim</em> calculated at the
Expand Down Expand Up @@ -3086,6 +3102,25 @@ public Date getPlagHaminchaAteretTorah() {
return getPlagHamincha(getAlos72Zmanis(), getTzaisAteretTorah(), false);
}

/**
* This method returns the time of <em>plag hamincha</em> based on the calculation of the Yalkut Yosef, that the
* day starts {@link #getSunrise() at sunrise} and is calculated as ending at {@link #getSunset() sunset}.
* <em>shaos zmaniyos</em> are calculated based on this day and
* removed from {@link #getTzaisGeonim13AndAHalfMinutesZmanis() <em>tzais</em>} to reach this time. This time is 1.25
* {@link #getShaahZmanisGra() <em>shaos zmaniyos</em>} (temporal hours) before {@link #getTzaisGeonim13AndAHalfMinutesZmanis() <em>tzais</em>}
*
* @return the <code>Date</code> of the <em>plag</em>. If the calculation can't be computed such as in the Arctic Circle
* where there is at least one day a year where the sun does not rise, and one where it does not set, a null
* will be returned. See detailed explanation on top of the {@link AstronomicalCalendar} documentation.
* @see #getTzaisGeonim13AndAHalfMinutesZmanis()
* @see #getShaahZmanisGra()
*/
public Date getPlagHaminchaYalkutYosef() {
long shaahZmanit = getTemporalHour(getElevationAdjustedSunrise(), getElevationAdjustedSunset());
long dakahZmanit = shaahZmanit / 60;
return getTimeOffset(getTzaisGeonim13AndAHalfMinutesZmanis(), -(shaahZmanit + (15 * dakahZmanit)));
}

/**
* Method to return <em>tzais</em> (dusk) calculated as 72 minutes zmaniyos, or 1/10th of the day after
* {@link #getSeaLevelSunset() sea level sunset}. This is the way that the <a href=
Expand Down
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