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<li><a href="../coordinates/index.html" accesskey="U">Astronomical Coordinate Systems (<tt class="docutils literal"><span class="pre">astropy.coordinates</span></tt>)</a> »</li>
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<div class="section" id="galacticcoordinates">
<h1>GalacticCoordinates<a class="headerlink" href="#galacticcoordinates" title="Permalink to this headline">¶</a></h1>
<dl class="class">
<dt id="astropy.coordinates.builtin_systems.GalacticCoordinates">
<em class="property">class </em><tt class="descclassname">astropy.coordinates.builtin_systems.</tt><tt class="descname">GalacticCoordinates</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="reference external" href="http://github.com/astropy/astropy/tree/v0.2.4/astropy/coordinates/builtin_systems.py#L388" title="Push the Edit button on the next page"><span class="edit-on-github viewcode-link"> [edit on github]</span></a><a class="reference internal" href="../_modules/astropy/coordinates/builtin_systems.html#GalacticCoordinates"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#astropy.coordinates.builtin_systems.GalacticCoordinates" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="astropy.coordinates.coordsystems.SphericalCoordinatesBase.html#astropy.coordinates.coordsystems.SphericalCoordinatesBase" title="astropy.coordinates.coordsystems.SphericalCoordinatesBase"><tt class="xref py py-class docutils literal"><span class="pre">astropy.coordinates.coordsystems.SphericalCoordinatesBase</span></tt></a></p>
<p>A coordinate in Galactic Coordinates.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Transformations from Galactic Coordinates to other systems are
not well-defined because of ambiguities in the definition of
Galactic Coordinates. See
<tt class="xref py py-obj docutils literal"><span class="pre">Lie</span> <span class="pre">et</span> <span class="pre">al.</span> <span class="pre">2011</span></tt>
for more details on this. Here, we use the
<tt class="xref py py-obj docutils literal"><span class="pre">Reid</span> <span class="pre">&</span> <span class="pre">Brunthaler</span> <span class="pre">2004</span></tt>
definition for converting to/from FK5, and assume the IAU
definition applies for converting to FK4 <em>without</em> e-terms.</p>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters :</th><td class="field-body"><p class="first"><strong>coordstr</strong> : str</p>
<blockquote>
<div><p>A single string with the coordinates. Cannot be used with
<tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> nor <tt class="xref py py-obj docutils literal"><span class="pre">x</span></tt>/<tt class="xref py py-obj docutils literal"><span class="pre">y</span></tt>/<tt class="xref py py-obj docutils literal"><span class="pre">z</span></tt>.</p>
</div></blockquote>
<p><strong>l</strong> : <tt class="xref py py-obj docutils literal"><span class="pre">Angle</span></tt>, float, int, str</p>
<blockquote>
<div><p>This must be given with <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt>.</p>
</div></blockquote>
<p><strong>b</strong> : <tt class="xref py py-obj docutils literal"><span class="pre">Angle</span></tt>, float, int, str</p>
<blockquote>
<div><p>This must be given with <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt>.</p>
</div></blockquote>
<p><strong>distance</strong> : <tt class="xref py py-obj docutils literal"><span class="pre">Distance</span></tt>, optional</p>
<blockquote>
<div><p>This may be given with <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> or <tt class="xref py py-obj docutils literal"><span class="pre">coordstr</span></tt>
and not <tt class="xref py py-obj docutils literal"><span class="pre">x</span></tt>, <tt class="xref py py-obj docutils literal"><span class="pre">y</span></tt>, or <tt class="xref py py-obj docutils literal"><span class="pre">z</span></tt>. If not given, <tt class="xref py py-obj docutils literal"><span class="pre">None</span></tt> (unit sphere)
will be assumed.</p>
</div></blockquote>
<p><strong>x</strong> : number</p>
<blockquote>
<div><p>The first cartesian coordinate. Must be given with <tt class="xref py py-obj docutils literal"><span class="pre">y</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">z</span></tt>
and not with <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> or <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> nor <tt class="xref py py-obj docutils literal"><span class="pre">coordstr</span></tt>.</p>
</div></blockquote>
<p><strong>y</strong> : number</p>
<blockquote>
<div><p>The second cartesian coordinate. Must be given with <tt class="xref py py-obj docutils literal"><span class="pre">x</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">z</span></tt>
and not with <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> or <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> nor <tt class="xref py py-obj docutils literal"><span class="pre">coordstr</span></tt>.</p>
</div></blockquote>
<p><strong>z</strong> : number</p>
<blockquote>
<div><p>The third cartesian coordinate. Must be given with <tt class="xref py py-obj docutils literal"><span class="pre">x</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">y</span></tt>
and not with <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> or <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> nor <tt class="xref py py-obj docutils literal"><span class="pre">coordstr</span></tt>.</p>
</div></blockquote>
<p><strong>cartpoint</strong> : <tt class="xref py py-obj docutils literal"><span class="pre">CartesianPoints</span></tt></p>
<blockquote>
<div><p>A cartesian point with the coordinates. Cannot be used with
any other arguments.</p>
</div></blockquote>
<p><strong>unit</strong> :</p>
<blockquote>
<div><p>The <tt class="xref py py-obj docutils literal"><span class="pre">unit</span></tt> parameter’s interpretation depends on what other
parameters are given:</p>
<ul>
<li><dl class="first docutils">
<dt>If <tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt> or <tt class="xref py py-obj docutils literal"><span class="pre">coordstr</span></tt> are given:</dt>
<dd><p class="first last"><tt class="xref py py-obj docutils literal"><span class="pre">unit</span></tt> must be a length-2 sequence specifying the units of
<tt class="xref py py-obj docutils literal"><span class="pre">l</span></tt> and <tt class="xref py py-obj docutils literal"><span class="pre">b</span></tt>, respectively. They can be either
<tt class="xref py py-obj docutils literal"><span class="pre">UnitBase</span></tt> objects or strings that will be
converted using <tt class="xref py py-obj docutils literal"><span class="pre">Unit</span></tt>. They can also be
None to attempt to automatically interpret the units (see
<a class="reference internal" href="astropy.coordinates.angles.Angle.html#astropy.coordinates.angles.Angle" title="astropy.coordinates.angles.Angle"><tt class="xref py py-obj docutils literal"><span class="pre">Angle</span></tt></a> for details.) If <tt class="xref py py-obj docutils literal"><span class="pre">unit</span></tt>
is just <tt class="xref py py-obj docutils literal"><span class="pre">None</span></tt>, this will be interpreted the same as
<tt class="docutils literal"><span class="pre">(None,</span> <span class="pre">None)</span></tt>.</p>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>If <tt class="xref py py-obj docutils literal"><span class="pre">x</span></tt>, <tt class="xref py py-obj docutils literal"><span class="pre">y</span></tt>, and <tt class="xref py py-obj docutils literal"><span class="pre">z</span></tt> are given:</dt>
<dd><p class="first last"><tt class="xref py py-obj docutils literal"><span class="pre">unit</span></tt> must be a single unit with dimensions of length</p>
</dd>
</dl>
</li>
</ul>
</div></blockquote>
<p><strong>obstime</strong> : <tt class="xref py py-obj docutils literal"><span class="pre">Time</span></tt> or None</p>
<blockquote>
<div><p>The time of observation for this coordinate. If None, it will be taken
to be the same as the <tt class="xref py py-obj docutils literal"><span class="pre">equinox</span></tt>.</p>
</div></blockquote>
<p><strong>Alternatively, a single argument that is any kind of spherical coordinate</strong> :</p>
<p><strong>can be provided, and will be converted to `GalacticCoordinates` and</strong> :</p>
<p class="last"><strong>used as this coordinate.</strong> :</p>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Attributes Summary</p>
<table border="1" class="longtable docutils">
<colgroup>
<col width="10%" />
<col width="90%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td><a class="reference internal" href="#astropy.coordinates.builtin_systems.GalacticCoordinates.latangle" title="astropy.coordinates.builtin_systems.GalacticCoordinates.latangle"><tt class="xref py py-obj docutils literal"><span class="pre">latangle</span></tt></a></td>
<td></td>
</tr>
<tr class="row-even"><td><a class="reference internal" href="#astropy.coordinates.builtin_systems.GalacticCoordinates.lonangle" title="astropy.coordinates.builtin_systems.GalacticCoordinates.lonangle"><tt class="xref py py-obj docutils literal"><span class="pre">lonangle</span></tt></a></td>
<td></td>
</tr>
</tbody>
</table>
<p class="rubric">Attributes Documentation</p>
<dl class="attribute">
<dt id="astropy.coordinates.builtin_systems.GalacticCoordinates.latangle">
<tt class="descname">latangle</tt><a class="reference internal" href="../_modules/astropy/coordinates/builtin_systems.html#GalacticCoordinates.latangle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#astropy.coordinates.builtin_systems.GalacticCoordinates.latangle" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="attribute">
<dt id="astropy.coordinates.builtin_systems.GalacticCoordinates.lonangle">
<tt class="descname">lonangle</tt><a class="reference internal" href="../_modules/astropy/coordinates/builtin_systems.html#GalacticCoordinates.lonangle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#astropy.coordinates.builtin_systems.GalacticCoordinates.lonangle" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
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<li><a class="reference internal" href="#">GalacticCoordinates</a></li>
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