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Formatting Coordinate Strings
-----------------------------
.. todo: @taldcroft should change this to start with a discussion of SkyCoord's capabilities
Getting a string representation of a coordinate is most powerfully
approached by treating the components (e.g., RA and Dec) separately.
For example::
>>> from astropy.coordinates import ICRS
>>> from astropy import units as u
>>> c = ICRS(187.70592*u.degree, 12.39112*u.degree)
>>> str(c.ra) + ' ' + str(c.dec)
'187d42m21.312s 12d23m28.032s'
To get better control over the formatting, you can use the angles'
:meth:`~astropy.coordinates.Angle.to_string` method (see :doc:`angles` for
more). For example::
>>> rahmsstr = c.ra.to_string(u.hour)
>>> str(rahmsstr)
'12h30m49.4208s'
>>> decdmsstr = c.dec.to_string(u.degree, alwayssign=True)
>>> str(decdmsstr)
'+12d23m28.032s'
>>> rahmsstr + ' ' + decdmsstr
u'12h30m49.4208s +12d23m28.032s'
You can also use python's `format` string method to create more complex
string expressions, such as IAU-style coordinates or even full sentences::
>>> 'SDSS J{0}{1}'.format(c.ra.to_string(unit=u.hourangle, sep='', precision=2, pad=True), c.dec.to_string(sep='', precision=2, alwayssign=True, pad=True))
'SDSS J123049.42+122328.03'
>>> 'The galaxy M87, at an RA of {0.ra.hour:.2f} hours and Dec of {0.dec.deg:.1f} degrees, has an impressive jet.'.format(c)
'The galaxy M87, at an RA of 12.51 hours and Dec of 12.4 degrees, has an impressive jet.'
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