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0001 <sect1 id="tool-jmoons">
0002 <title>Jupiter Moons Tool</title>
0003 <indexterm><primary>Tools</primary>
0004 <secondary>Jupiter Moons Tool</secondary>
0005 </indexterm>
0007 <screenshot>
0008 <screeninfo>
0009 The Jupiter Moons Tool
0010 </screeninfo>
0011 <mediaobject>
0012   <imageobject>
0013     <imagedata fileref="jmoons.png" format="PNG"/>
0014   </imageobject>
0015   <textobject>
0016     <phrase>Jupiter Moons Tool</phrase>
0017   </textobject>
0018 </mediaobject>
0019 </screenshot>
0021 <para>
0022 This tool displays the positions of Jupiter's four largest
0023 moons (Io, Europa, Ganymede, and Callisto) relative to Jupiter,
0024 as a function of time.  Time is plotted vertically; the units are days
0025 and <quote>time=0.0</quote> corresponds to the current simulation time.
0026 The horizontal axis displays the angular offset from Jupiter's position,
0027 in arcminutes.  The offset is measured along the direction of Jupiter's
0028 equator.  Each moon's position as a function of time traces a sinusoidal
0029 path in the plot, as the moon orbits around Jupiter.  Each track is
0030 assigned a different color to distinguish it from the others; the name
0031 labels at the top of the window indicate the color used by each moon
0032 (&ie; red for Io, yellow for Europa, green for Callisto and blue for Ganymede).
0033 </para><para>
0034 The plot can be manipulated with the keyboard.  The time axis can be
0035 expanded or compressed using the <keycap>+</keycap> and
0036 <keycap>-</keycap> keys.  The time displayed at the center of the window
0037 can be changed with the <keycap>[</keycap> and <keycap>]</keycap> keys.
0038 </para>
0039 </sect1>