net.time4j.history

Class AncientJulianLeapYears

java.lang.Object

net.time4j.history.AncientJulianLeapYears

public final class AncientJulianLeapYears
extends Object

Represents a historic leap year pattern for the early days of julian calendar before AD 8.

The real historic leap years as triennal pattern before AD 8 are not yet known for certainty and are controversely debated among historicians. Anyway, all non-proleptic patterns start the julian calendar in 45 BC and are to be considered invalid before that year. These patterns mainly serve for comparison and must not be interpreted as absolute truth.

Since:

3.11/4.8

Author:

Meno Hochschild

Field Summary

Fields

Modifier and Type	Field and Description
static AncientJulianLeapYears	SCALIGER Proposed by Joseph Justus Scaliger in year 1583, the leap years are assumed to be 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12, 9 (BC).

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
int	hashCode()
static AncientJulianLeapYears	of(int... bcYears) Creates a new sequence of historical julian leap years before AD 8.
String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

SCALIGER

public static final AncientJulianLeapYears SCALIGER

Proposed by Joseph Justus Scaliger in year 1583, the leap years are assumed to be 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12, 9 (BC).

This is the most widely used assumption among historicians.

Method Detail

of

public static AncientJulianLeapYears of(int... bcYears)

Creates a new sequence of historical julian leap years before AD 8.

Example: In order to model the proposal of Matzat (1883), users can use the code of(44, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11, -3). The last parameter -3 stands here for the year AD 4 using the formula 1 - year which shall also be a leap year in the version of Matzat. For an overview about different proposals see Wikipedia.

Parameters:

bcYears - positive numbers for BC-years

Returns:

new instance

Throws:

IllegalArgumentException - if given years are missing or out of range BC 45 <= bcYear < AD 8

Since:

3.11/4.8

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object