Package net.time4j.calendar.astro

Enum Class Twilight

java.lang.Object

java.lang.Enum<Twilight>

net.time4j.calendar.astro.Twilight

All Implemented Interfaces:

Serializable, Comparable<Twilight>, java.lang.constant.Constable

public enum Twilight
extends Enum<Twilight>

Enumeration of various twilight definitions.

See also Wikipedia.

Since:

3.34/4.29

Author:

Meno Hochschild

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
ASTRONOMICAL	Marks the time when the sun is 18 degrees below the horizon.
BLUE_HOUR	Marks the time when the sun is 4 degrees below the horizon.
CIVIL	Marks the time when the sun is 6 degrees below the horizon.
NAUTICAL	Marks the time when the sun is 12 degrees below the horizon.

Method Summary

Modifier and Type	Method	Description
static Twilight	valueOf(String name)	Returns the enum constant of this class with the specified name.
static Twilight[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, describeConstable, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

BLUE_HOUR

public static final Twilight BLUE_HOUR

Marks the time when the sun is 4 degrees below the horizon.

Mainly used by photographers. There is no official definition but usually photographers talk about the blue hour when the sun is between 4 and eight degrees below the horizon. See also Wikipedia.

CIVIL

public static final Twilight CIVIL

Marks the time when the sun is 6 degrees below the horizon.

NAUTICAL

public static final Twilight NAUTICAL

Marks the time when the sun is 12 degrees below the horizon.

ASTRONOMICAL

public static final Twilight ASTRONOMICAL

Marks the time when the sun is 18 degrees below the horizon.

Is the sun even deeper below the horizon then people talk about night.

Method Details

values

public static Twilight[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static Twilight valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null