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<title>GNU Scientific Library &ndash; Reference Manual: Astronomy and Astrophysics</title>

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<a name="Astronomy-and-Astrophysics"></a>
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<p>
Next: <a href="Atomic-and-Nuclear-Physics.html#Atomic-and-Nuclear-Physics" accesskey="n" rel="next">Atomic and Nuclear Physics</a>, Previous: <a href="Fundamental-Constants.html#Fundamental-Constants" accesskey="p" rel="previous">Fundamental Constants</a>, Up: <a href="Physical-Constants.html#Physical-Constants" accesskey="u" rel="up">Physical Constants</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Astronomy-and-Astrophysics-1"></a>
<h3 class="section">44.2 Astronomy and Astrophysics</h3>
<a name="index-astronomical-constants"></a>
<dl compact="compact">
<dt><code>GSL_CONST_MKSA_ASTRONOMICAL_UNIT</code></dt>
<dd><p>The length of 1 astronomical unit (mean earth-sun distance), <em>au</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_GRAVITATIONAL_CONSTANT</code></dt>
<dd><p>The gravitational constant, <em>G</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_LIGHT_YEAR</code></dt>
<dd><p>The distance of 1 light-year, <em>ly</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_PARSEC</code></dt>
<dd><p>The distance of 1 parsec, <em>pc</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_GRAV_ACCEL</code></dt>
<dd><p>The standard gravitational acceleration on Earth, <em>g</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_SOLAR_MASS</code></dt>
<dd><p>The mass of the Sun.
</p></dd>
</dl>




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