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<div class="section" id="air-mass-coefficient-dialog">
<span id="index-0"></span><span id="id1"></span><h1>Air mass coefficient (dialog)<a class="headerlink" href="#air-mass-coefficient-dialog" title="Permalink to this headline">¶</a></h1>
<p>The “Air mass coefficient” allows an user to compute air mass coefficient for specified star,
location and date of observation. The object’s altitude in degrees is also presented.</p>
<div class="section" id="activating-the-dialog">
<h2>Activating the dialog<a class="headerlink" href="#activating-the-dialog" title="Permalink to this headline">¶</a></h2>
<p>The dialog can be activated:</p>
<ol class="arabic simple">
<li>from the main menu: <em class="menuselection">Tools ‣ Air mass coefficient</em>.</li>
</ol>
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<div class="section" id="computing-air-mass-coefficient-and-object-s-altitude">
<span id="index-1"></span><h2>Computing air mass coefficient and object’s altitude<a class="headerlink" href="#computing-air-mass-coefficient-and-object-s-altitude" title="Permalink to this headline">¶</a></h2>
<div class="figure align-center">
<img alt="Air mass coefficient" src="_images/airmass_couts2.png" />
<p class="caption">Computing air mass coefficient and object’s altitude</p>
</div>
<p>Enter object’s right ascension to the text box (1) in hours. Use the hexagesimal format, separate
the fields by a space character.</p>
<p>Enter object’s declination to the text box (2) in degrees. Use the hexagesimal format, separate
the fields by a space character.</p>
<p>Click the ellipsis button (3) to retrieve object’s coordinates from a table of predefined
objects or a catalog of variable stars.</p>
<p>Enter observer’s longitude to the text box (4) in degrees. Use the hexagesimal format, separate
the fields by a space character. Enter ‘E’ character at the first position in a string to indicate
that the location is on the eastern hemisphere or ‘W’ character for locations on a western hemisphere.</p>
<p>Enter observer’s latitude to the text box (5) in degrees. Use the hexagesimal format, separate
the fields by a space character. Enter ‘N’ character at the first position in s string to indicate
that the location is on the north hemisphere or ‘S’ character for locations on a southern hemisphere.</p>
<p>Click the ellipsis button (6) to retrieve observer’s coordinates from a table of predefined
locations.</p>
<p>(7) Enter a Julian date into the text box. As you type in the data, corresponding value of
air mass coefficient and altitude is updated in the last two text boxes (8, 9).</p>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="jd_converter_dialog.html#jd-converter-dialog"><em>JD converter (dialog)</em></a>, <a class="reference internal" href="heliocentric_correction_dialog.html#heliocentric-correction-dialog"><em>Heliocentric correction (dialog)</em></a></p>
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<h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Air mass coefficient (dialog)</a><ul>
<li><a class="reference internal" href="#activating-the-dialog">Activating the dialog</a></li>
<li><a class="reference internal" href="#computing-air-mass-coefficient-and-object-s-altitude">Computing air mass coefficient and object’s altitude</a></li>
</ul>
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