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.
46 lines
1.4 KiB
46 lines
1.4 KiB
13 years ago
|
<sect2 id="calc-apcoords">
|
||
|
|
<title
|
||
|
|
>Apparent Coordinates module</title>
|
||
|
|
<indexterm
|
||
|
|
><primary
|
||
|
|
>Tools</primary>
|
||
|
|
<secondary
|
||
|
|
>Astrocalculator</secondary>
|
||
|
|
<tertiary
|
||
|
|
>Apparent Coordinates module</tertiary>
|
||
|
|
</indexterm>
|
||
|
|
|
||
|
|
<screenshot>
|
||
|
|
<screeninfo
|
||
|
|
>The Apparent Coordinates calculator module </screeninfo>
|
||
|
|
<mediaobject>
|
||
|
|
<imageobject>
|
||
|
|
<imagedata fileref="calc-apcoords.png" format="PNG"/>
|
||
|
|
</imageobject>
|
||
|
|
<textobject>
|
||
|
|
<phrase
|
||
|
|
>Apparent Coordinates</phrase>
|
||
|
|
</textobject>
|
||
|
|
</mediaobject>
|
||
|
|
</screenshot>
|
||
|
|
|
||
|
|
<para
|
||
|
|
>The Apparent Coordinates module converts the <firstterm
|
||
|
|
>catalogue coordinates</firstterm
|
||
|
|
> of a point in the sky to its <firstterm
|
||
|
|
>apparent coordinates</firstterm
|
||
|
|
> for any date. The coordinates of objects in the sky are not fixed, because of <link linkend="ai-precession"
|
||
|
|
>precession</link
|
||
|
|
>, nutation and aberration. This module takes these effects into account. </para>
|
||
|
|
<para
|
||
|
|
>To use the module, first enter the desired target date and time in the <guilabel
|
||
|
|
>Target Time/Date</guilabel
|
||
|
|
> section. Then, enter the catalogue coordinates in the <guilabel
|
||
|
|
>Catalog Coordinates</guilabel
|
||
|
|
> section. You can also specify the catalogue's epoch here (usually 2000.0 for modern object catalogues). Finally, press the <guibutton
|
||
|
|
>Compute</guibutton
|
||
|
|
> button, and the object's coordinates for the target date will be displayed in the <guilabel
|
||
|
|
>Apparent Coordinates</guilabel
|
||
|
|
> section. </para>
|
||
|
|
</sect2>
|