You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.1 KiB
44 lines
1.1 KiB
13 years ago
|
<sect2 id="calc-precess">
|
||
|
|
<title
|
||
|
|
>Precession module</title>
|
||
|
|
<indexterm
|
||
|
|
><primary
|
||
|
|
>Tools</primary>
|
||
|
|
<secondary
|
||
|
|
>Astrocalculator</secondary>
|
||
|
|
<tertiary
|
||
|
|
>Precession module</tertiary>
|
||
|
|
</indexterm>
|
||
|
|
|
||
|
|
<screenshot>
|
||
|
|
<screeninfo
|
||
|
|
>The Precession calculator module </screeninfo>
|
||
|
|
<mediaobject>
|
||
|
|
<imageobject>
|
||
|
|
<imagedata fileref="calc-precess.png" format="PNG"/>
|
||
|
|
</imageobject>
|
||
|
|
<textobject>
|
||
|
|
<phrase
|
||
|
|
>Precession</phrase>
|
||
|
|
</textobject>
|
||
|
|
</mediaobject>
|
||
|
|
</screenshot>
|
||
|
|
|
||
|
|
<para
|
||
|
|
>This module is similar to the <link linkend="calc-apcoords"
|
||
|
|
>Apparent Coordinates module</link
|
||
|
|
>, but it only applies the effect of <link linkend="ai-precession"
|
||
|
|
>precession</link
|
||
|
|
>, not of nutation or aberration. </para>
|
||
|
|
<para
|
||
|
|
>To use the module, first enter the input coordinates and their epoch in the <guilabel
|
||
|
|
>Original Coordinates</guilabel
|
||
|
|
> section. You must also fill in the target epoch in the <guilabel
|
||
|
|
>Precessed Coordinates</guilabel
|
||
|
|
> section. Then, press the <guibutton
|
||
|
|
>Compute</guibutton
|
||
|
|
> button, and the object's coordinates, precessed to the target Epoch, are presented in the <guilabel
|
||
|
|
>Precessed Coordinates</guilabel
|
||
|
|
> section. </para>
|
||
|
|
</sect2>
|