Package org.shredzone.commons.suncalc.util

Class Sun

java.lang.Object

org.shredzone.commons.suncalc.util.Sun

public final class Sun
extends Object

Calculations and constants for the Sun.

See Also:

• "Astronomy on the Personal Computer, 4th edition (Oliver Montenbruck, Thomas Pfleger) - ISBN 978-3-540-67221-0"

Method Summary

Modifier and Type	Method	Description
static double	angularRadius(double distance)	Returns the angular radius of the sun.
static Vector	position(JulianDate date)	Calculates the geocentric position of the sun.
static Vector	positionEquatorial(JulianDate date)	Calculates the equatorial position of the sun.
static Vector	positionHorizontal(JulianDate date, double lat, double lng)	Calculates the horizontal position of the sun.
static Vector	positionTopocentric(JulianDate date, double lat, double lng, double elev)	Calculates the topocentric position of the sun.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

positionEquatorial

public static Vector positionEquatorial(JulianDate date)

Calculates the equatorial position of the sun.

Parameters:

date - JulianDate to be used

Returns:

Vector containing the sun position

position

public static Vector position(JulianDate date)

Calculates the geocentric position of the sun.

Parameters:

date - JulianDate to be used

Returns:

Vector containing the sun position

positionHorizontal

public static Vector positionHorizontal(JulianDate date,
 double lat,
 double lng)

Calculates the horizontal position of the sun.

Parameters:

date - JulianDate to be used

lat - Latitude, in radians

lng - Longitute, in radians

Returns:

Vector of horizontal sun position

positionTopocentric

public static Vector positionTopocentric(JulianDate date,
 double lat,
 double lng,
 double elev)

Calculates the topocentric position of the sun.

Atmospheric refraction is not taken into account.

Parameters:

date - JulianDate to be used

lat - Latitude, in radians

lng - Longitute, in radians

elev - Elevation, in meters

Returns:

Vector of topocentric sun position

Since:

3.9

angularRadius

public static double angularRadius(double distance)

Returns the angular radius of the sun.

Parameters:

distance - Distance of the sun, in kilometers.

Returns:

Angular radius of the sun, in radians.

See Also:

• Wikipedia: Angular Diameter