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0001 <sect1 id="tool-solarsys"> 0002 <title>Solar System Viewer</title> 0003 <indexterm><primary>Tools</primary> 0004 <secondary>Solar System Viewer</secondary> 0005 </indexterm> 0006 0007 <screenshot> 0008 <screeninfo> 0009 The Solar System Viewer 0010 </screeninfo> 0011 <mediaobject> 0012 <imageobject> 0013 <imagedata fileref="solarsystem.png" format="PNG"/> 0014 </imageobject> 0015 <textobject> 0016 <phrase>Solar System Viewer</phrase> 0017 </textobject> 0018 </mediaobject> 0019 </screenshot> 0020 0021 <para> 0022 This tool displays a model of our solar system as seen from 0023 above. The Sun is drawn as a yellow dot in the center of the 0024 plot, and the orbits of the planets are drawn as ellipses with 0025 the correct shapes and orientations. The current position 0026 of each planet along its orbit is drawn as a colored dot, along 0027 with a name label. The display can be zoomed in and out with 0028 the <keycap>+</keycap> and <keycap>-</keycap> keys, and the 0029 display can be recentered with the arrow keys, or by 0030 double-clicking anywhere in the window with the mouse. You can 0031 also center on a planet with the <keycap>0</keycap>–<keycap>9</keycap> keys 0032 (<keycap>0</keycap> is the Sun; <keycap>9</keycap> is Pluto). 0033 If you center on a planet, it will be tracked as time passes in 0034 the tool. 0035 </para> 0036 <para> 0037 The Solar System Viewer has its own clock, independent of the 0038 clock in the main &kstars; window. There is a timestep control 0039 widget here, similar to the one in the main window's toolbar. 0040 However, this control defaults to a timestep of 1 day (so that 0041 the motions of the planets can be seen), and it starts out with 0042 the clock paused when the tool is opened. You may set the date to now 0043 by pressing the <guibutton>Today</guibutton> button. 0044 </para> 0045 <note> 0046 <para> 0047 The current model used for Pluto's orbit is only good for dates 0048 within about 100 years of the present date. If you let the Solar 0049 System clock advance beyond this range, you will see Pluto behave 0050 very strangely! We are aware of this issue, and will try to 0051 improve Pluto's orbit model soon. 0052 </para> 0053 </note> 0054 </sect1>