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feat: add WGS84 geocentric radius with refraction-corrected dip #282

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22 changes: 11 additions & 11 deletions src/main/java/com/kosherjava/zmanim/AstronomicalCalendar.java
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,7 @@ public class AstronomicalCalendar implements Cloneable {
* 90° below the vertical. Used as a basis for most calculations since the location of the sun is 90° below the horizon
* at sunrise and sunset.
* <b>Note </b>: it is important to note that for sunrise and sunset the {@link AstronomicalCalculator#adjustZenith(double,
* double, LocalDate) adjusted zenith} is required to account for the radius of the sun and refraction. The adjusted zenith should
* double, double, LocalDate) adjusted zenith} is required to account for the radius of the sun and refraction. The adjusted zenith should
* not be used for calculations above or below 90° since they are usually calculated as an offset to 90°.
*/
public static final double GEOMETRIC_ZENITH = 90;
Expand Down Expand Up @@ -110,16 +110,16 @@ public class AstronomicalCalendar implements Cloneable {

/**
* The getSunrise method returns a {@code Instant} representing the {@link AstronomicalCalculator
* #getElevationAdjustment(double) elevation adjusted} sunrise time. The zenith used for the calculation uses {@link
* #GEOMETRIC_ZENITH geometric zenith} of 90° plus {@link AstronomicalCalculator#getElevationAdjustment(double)}. This is
* #getElevationAdjustment(double, double) elevation adjusted} sunrise time. The zenith used for the calculation uses {@link
* #GEOMETRIC_ZENITH geometric zenith} of 90° plus {@link AstronomicalCalculator#getElevationAdjustment(double, double)}. This is
* adjusted by the {@link AstronomicalCalculator} to add approximately 50/60 of a degree to account for 34 arcminutes of
* refraction and 16 arcminutes for the sun's radius for a total of {@link AstronomicalCalculator#adjustZenith 90.83333°}.
* refraction and 16 arcminutes for the sun's radius for a total of {@link AstronomicalCalculator#adjustZenith(double, double, double, LocalDate) 90.83333°}.
* See documentation for the specific implementation of the {@link AstronomicalCalculator} that you are using.
*
* @return the {@code Instant} representing the exact sunrise time. 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
* {@code null} will be returned. See detailed explanation on top of the page.
* @see AstronomicalCalculator#adjustZenith(double, double, LocalDate)
* @see AstronomicalCalculator#adjustZenith(double, double, double, LocalDate)
* @see #getSeaLevelSunrise()
* @see #getUTCSunrise(double)
*/
Expand All @@ -133,7 +133,7 @@ public Instant getSunrise() {
}

/**
* A method that returns the sunrise without {@link AstronomicalCalculator#getElevationAdjustment(double) elevation
* A method that returns the sunrise without {@link AstronomicalCalculator#getElevationAdjustment(double, double) elevation
* adjustment}. Non-sunrise and sunset calculations such as dawn and dusk, depend on the amount of visible light,
* something that is not affected by elevation. This method returns sunrise calculated at sea level. This forms the
* base for dawn calculations that are calculated as a dip below the horizon before sunrise.
Expand Down Expand Up @@ -189,11 +189,11 @@ public Instant getBeginAstronomicalTwilight() {

/**
* The getSunset method returns an {@code Instant} representing the
* {@link AstronomicalCalculator#getElevationAdjustment(double) elevation adjusted} sunset time. The zenith used for the
* {@link AstronomicalCalculator#getElevationAdjustment(double, double) elevation adjusted} sunset time. The zenith used for the
* calculation uses {@link #GEOMETRIC_ZENITH geometric zenith} of 90° plus {@link AstronomicalCalculator
* #getElevationAdjustment(double)}. This is adjusted by the {@link AstronomicalCalculator} to add approximately 50/60 of a
* #getElevationAdjustment(double, double)}. This is adjusted by the {@link AstronomicalCalculator} to add approximately 50/60 of a
* degree to account for 34 arcminutes of refraction and 16 arcminutes for the sun's radius for a total of {@link
* AstronomicalCalculator#adjustZenith(double, double, LocalDate) 90.83333°}. See documentation for the specific implementation of the
* AstronomicalCalculator#adjustZenith(double, double, double, LocalDate) 90.83333°}. See documentation for the specific implementation of the
* {@link AstronomicalCalculator} that you are using.
* Note: In certain cases the calculates sunset will occur before sunrise. This will typically happen when a time zone other than
* the local timezone is used (calculating Los Angeles sunset using a GMT time zone for example). In this case the sunset date
Expand All @@ -203,7 +203,7 @@ public Instant getBeginAstronomicalTwilight() {
* @return the {@code Instant} representing the exact sunset time. 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
* {@code null} will be returned. See detailed explanation on top of the page.
* @see AstronomicalCalculator#adjustZenith(double, double, LocalDate)
* @see AstronomicalCalculator#adjustZenith(double, double, double, LocalDate)
* @see #getSeaLevelSunset()
* @see #getUTCSunset(double)
*/
Expand All @@ -217,7 +217,7 @@ public Instant getSunset() {
}

/**
* A method that returns the sunset without {@link AstronomicalCalculator#getElevationAdjustment(double) elevation adjustment}.
* A method that returns the sunset without {@link AstronomicalCalculator#getElevationAdjustment(double, double) elevation adjustment}.
* Non-sunrise and sunset calculations such as dawn and dusk, depend on the amount of visible light, something that is not
* affected by elevation. This method returns sunset calculated at sea level. This forms the base for dusk calculations that are
* calculated as a dip below the horizon after sunset.
Expand Down
4 changes: 2 additions & 2 deletions src/main/java/com/kosherjava/zmanim/ZmanimCalendar.java
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1256,7 +1256,7 @@ public boolean isAssurBemelacha(Instant currentTime, Instant tzais, boolean inIs

/**
* A method that returns the <a href="https://en.wikipedia.org/wiki/Shneur_Zalman_of_Liadi">Baal Hatanya</a>'s <em>netz amiti</em>
* (sunrise) without {@link AstronomicalCalculator#getElevationAdjustment(double)}. This forms the base for the Baal Hatanya's
* (sunrise) without {@link AstronomicalCalculator#getElevationAdjustment(double, double)}. This forms the base for the Baal Hatanya's
* dawn-based calculations that are calculated as a dip below the horizon before sunrise. According to the Baal Hatanya, <em>netz
* amiti</em>, or true (halachic) sunrise, is when the top of the sun's disk is visible at an elevation similar to the mountains
* of Eretz Yisrael. The time is calculated as the point at which the center of the sun's disk is 1.583° below the horizon. This
Expand Down Expand Up @@ -1290,7 +1290,7 @@ protected Instant getSunriseBaalHatanya() {

/**
* A method that returns the <a href="https://en.wikipedia.org/wiki/Shneur_Zalman_of_Liadi">Baal Hatanya</a>'s <em>shkiah
* amiti</em> (sunset) without {@link AstronomicalCalculator#getElevationAdjustment(double) elevation adjustment}. This forms
* amiti</em> (sunset) without {@link AstronomicalCalculator#getElevationAdjustment(double, double) elevation adjustment}. This forms
* the base for the Baal Hatanya's dusk-based calculations that are calculated as a dip below the horizon after sunset. According
* to the Baal Hatanya, <em>shkiah amiti</em>, true (<em>halachic</em>) sunset, is when the top of the sun's disk disappears from
* view at an elevation similar to the mountains of <em>Eretz Yisrael</em>. This time is calculated as the point at which the
Expand Down
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