net.time4j.calendar.astro

Enum Twilight

java.lang.Object

java.lang.Enum<Twilight>

net.time4j.calendar.astro.Twilight

All Implemented Interfaces:

Serializable, Comparable<Twilight>

public enum Twilight
extends Enum<Twilight>

Enumeration of various twilight definitions.

See also Wikipedia.

Since:

3.34/4.29

Author:

Meno Hochschild

Enum Constant Summary

Enum Constants

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

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 Detail

values

public static Twilight[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Twilight c : Twilight.values())
    System.out.println(c);

Returns:

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

valueOf

public static Twilight valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null