com.github.davidmoten.grumpy.wms.layer.darkness

Class SunUtil

java.lang.Object

com.github.davidmoten.grumpy.wms.layer.darkness.SunUtil

public final class SunUtil
extends Object

Utility methods related to the position of the Sun relative to the Earth.

Author:

Steven Ring

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SunUtil.Twilight

Method Summary

Modifier and Type	Method and Description
static com.github.davidmoten.grumpy.core.Position	getSubSolarPoint() Gets the position of the Sun right now.
static com.github.davidmoten.grumpy.core.Position	getSubSolarPoint(Calendar time) Returns the position on the Earth's surface for which the sun appears to be straight above.
static SunUtil.Twilight	getTwilight(double sunDistanceRadians) Return the twilight condition for a point which is a given great circle distance from the current sub solar point.
static SunUtil.Twilight	getTwilight(com.github.davidmoten.grumpy.core.Position subSolarPoint, com.github.davidmoten.grumpy.core.Position somePosition)

Methods inherited from class java.lang.Object

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

Method Detail

getTwilight

public static SunUtil.Twilight getTwilight(double sunDistanceRadians)

Return the twilight condition for a point which is a given great circle distance from the current sub solar point.

Parameters:

sunDistanceRadians - - from the current positon to the sub solar point

Returns:

The twilight condition

getTwilight

public static SunUtil.Twilight getTwilight(com.github.davidmoten.grumpy.core.Position subSolarPoint,
                                           com.github.davidmoten.grumpy.core.Position somePosition)

getSubSolarPoint

public static com.github.davidmoten.grumpy.core.Position getSubSolarPoint()

Gets the position of the Sun right now.

Returns:

position of the sun now

getSubSolarPoint

public static com.github.davidmoten.grumpy.core.Position getSubSolarPoint(Calendar time)

Returns the position on the Earth's surface for which the sun appears to be straight above.

Parameters:

time -

Returns:

position of the sub-solar point