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This class provides methods for accessing information from the World Coordinate System (WCS) contained in the header of a FITS image. Conversions between pixel and WCS coordinates can also be performed.
To create a WCS object from a FITS file called "test.fits", simply:
WCS=astWCS.WCS("test.fits")
Likewise, to create a WCS object from the pyfits.header of "test.fits":
img=pyfits.open("test.fits") header=img[0].header WCS=astWCS.WCS(header, mode = "pyfits")
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 Creates a WCS object using either the information contained in the header of the specified .fits image, or from a pyfits.header object. Set mode = "pyfits" if the headerSource is a pyfits.header. For some images from some archives, particular header keywords such as COMMENT or HISTORY may contain unprintable strings. If you encounter this, try setting zapKeywords = ['COMMENT', 'HISTORY'] (for example). 
 Note: The meta data provided by headerSource is stored in WCS.header as a pyfits.header object. | 
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 Copies the WCS object to a new object. 
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 Updates the WCS object using information from WCS.header. This routine should be called whenever changes are made to WCS keywords in WCS.header. | 
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 Returns the RA and dec coordinates (in decimal degrees) at the centre of the WCS. 
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 Returns the width, height of the image according to the WCS in decimal degrees on the sky (i.e., with the projection taken into account). 
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 Returns the half-width, half-height of the image according to the WCS in RA and dec degrees. 
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 Returns the minimum, maximum WCS coords defined by the size of the parent image (as defined by the NAXIS keywords in the image header). 
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 Returns the pixel coordinates corresponding to the input WCS coordinates (given in decimal degrees). RADeg, decDeg can be single floats, or lists or numpy arrays. 
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 Returns the WCS coordinates corresponding to the input pixel coordinates. 
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 Returns True if the given RA, dec coordinate is within the image boundaries. 
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 Returns the rotation angle in degrees around the axis, North through East. 
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 Returns 1 if image is reflected around axis, otherwise returns 0. 
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 Returns the pixel scale of the WCS. This is the average of the x, y pixel scales. 
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 Returns the pixel scale along the x-axis of the WCS in degrees. 
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 Returns the pixel scale along the y-axis of the WCS in degrees. 
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 Returns the equinox of the WCS. 
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 Returns the epoch of the WCS. 
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