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46 lines
1.0 KiB
46 lines
1.0 KiB
13 years ago
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<sect2 id="calc-julian">
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<title
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>Julian Day module</title>
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<indexterm
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><primary
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>Tools</primary>
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<secondary
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>Astrocalculator</secondary>
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<tertiary
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>Julian Day module</tertiary>
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</indexterm>
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<screenshot>
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<screeninfo
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>The Julian Day calculator module </screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="calc-julian.png" format="PNG"/>
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</imageobject>
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<textobject>
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<phrase
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>Julian Day</phrase>
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</textobject>
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</mediaobject>
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</screenshot>
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<para
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>This module converts between the calendar date, the <link linkend="ai-julianday"
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>Julian Day</link
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> and the <firstterm
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>Modified Julian Day</firstterm
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>. The Modified Julian Day is simply equal to the Julian Day - 2,400,000.5. </para
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><para
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>To use the module, select which of the three dates will be the input, and then fill in its value. Then press the <guibutton
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>Compute</guibutton
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> button, and the corresponding values for the other two date systems will be displayed. </para>
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<tip>
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<para
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>Exercise:</para>
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<para
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>What calendar date does MJD = 0.0 correspond to? </para>
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</tip>
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</sect2>
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