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39 lines
1.4 KiB
39 lines
1.4 KiB
<sect1 id="tool-jmoons">
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<title>Jupiter Moons Tool</title>
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<indexterm><primary>Tools</primary>
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<secondary>Jupiter Moons Tool</secondary>
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</indexterm>
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<screenshot>
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<screeninfo>
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The Jupiter Moons Tool
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</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="jmoons.png" format="PNG"/>
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</imageobject>
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<textobject>
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<phrase>Jupiter Moons Tool</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 tool displays the positions of Jupiter's four largest
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moons (Io, Europa, Ganymede, and Callisto) relative to Jupiter,
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as a function of time. Time is plotted vertically; the units are days
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and <quote>time=0.0</quote> corresponds to the current simulation time.
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The horizontal axis displays the angular offset from Jupiter's position,
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in arcminutes. The offset is measured along the direction of Jupiter's
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equator. Each moon's position as a function of time traces a sinusoidal
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path in the plot, as the moon orbits around Jupiter. Each track is
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assigned a different color to distinguish it from the others; the name
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labels at the top of the window indicate the color used by each moon.
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</para><para>
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The plot can be manipulated with the keyboard. The time axis can be
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expanded or compressed using the <keycap>+</keycap> and
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<keycap>-</keycap> keys. The time displayed at the center of the window
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can be changed with the <keycap>[</keycap> and <keycap>]</keycap> keys.
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</para>
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</sect1>
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