Class ExtendedMath
java.lang.Object
org.shredzone.commons.suncalc.util.ExtendedMath
Contains constants and mathematical operations that are not available in
Math
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Field Summary
Modifier and TypeFieldDescriptionstatic final double
Arc-Seconds per Radian.static final double
Mean radius of the earth, in kilometers.static final double
PI * 2 -
Method Summary
Modifier and TypeMethodDescriptionstatic double
apparentRefraction
(double ha) Calculates the atmospheric refraction of an object at the given apparent altitude.static Matrix
Creates a rotationalMatrix
for converting equatorial to ecliptical coordinates.static Vector
equatorialToHorizontal
(double tau, double dec, double dist, double lat) Converts equatorial coordinates to horizontal coordinates.static double
frac
(double a) Returns the decimal part of a value.static boolean
isZero
(double d) Performs a safe check if the given double is actually zero (0.0).static double
parallax
(double height, double distance) Returns the parallax for objects at the horizon.static double
refraction
(double h) Calculates the atmospheric refraction of an object at the given altitude.
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Field Details
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PI2
PI * 2- See Also:
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ARCS
Arc-Seconds per Radian. -
EARTH_MEAN_RADIUS
Mean radius of the earth, in kilometers.- See Also:
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Method Details
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frac
Returns the decimal part of a value.- Parameters:
a
- Value- Returns:
- Fraction of that value. It has the same sign as the input value.
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isZero
Performs a safe check if the given double is actually zero (0.0).Note that "almost zero" returns
false
, so this method should not be used for comparing calculation results to zero.- Parameters:
d
- double to check for zero.- Returns:
true
if the value was zero, or negative zero.
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equatorialToHorizontal
Converts equatorial coordinates to horizontal coordinates.- Parameters:
tau
- Hour angle (radians)dec
- Declination (radians)dist
- Distance of the objectlat
- Latitude of the observer (radians)- Returns:
Vector
containing the horizontal coordinates
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equatorialToEcliptical
Creates a rotationalMatrix
for converting equatorial to ecliptical coordinates.- Parameters:
t
-JulianDate
to use- Returns:
Matrix
for converting equatorial to ecliptical coordinates
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parallax
Returns the parallax for objects at the horizon.- Parameters:
height
- Observer's height, in meters above sea level. Must not be negative.distance
- Distance of the sun, in kilometers.- Returns:
- parallax, in radians
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apparentRefraction
Calculates the atmospheric refraction of an object at the given apparent altitude.The result is only valid for positive altitude angles. If negative, 0.0 is returned.
Assumes an atmospheric pressure of 1010 hPa and a temperature of 10 °C.
- Parameters:
ha
- Apparent altitude, in radians.- Returns:
- Refraction at this altitude
- See Also:
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refraction
Calculates the atmospheric refraction of an object at the given altitude.The result is only valid for positive altitude angles. If negative, 0.0 is returned.
Assumes an atmospheric pressure of 1010 hPa and a temperature of 10 °C.
- Parameters:
h
- True altitude, in radians.- Returns:
- Refraction at this altitude
- See Also:
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