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</chapter><chapter id="set_program_options"><title>Set Program Options</title><para>When you use &celestia; for the first time, you will need to choose some options that will tell the program how you want things done. &celestia; will remember these settings once you initially establish them. However, during your subsequent use of &celestia;, you may have need to change or reset these options.</para><para><guimenuitem>Display Mode</guimenuitem>: To open the <guimenu>Render</guimenu> menu, <mousebutton>left</mousebutton>-click on the word <guimenu>Render</guimenu> at the top of the &celestia; view screen and choose <guimenuitem>Select Display Mode</guimenuitem> or <guimenuitem>Toggle Full Screen</guimenuitem>. These are instructions to &celestia; to change the resolution of the view screen. Choose the <guimenuitem>Select Display Mode</guimenuitem> menu first to choose the size of the viewscreen you prefer.</para><para><guimenuitem>Windowed Mode</guimenuitem> is the default choice and sets your screen to the same resolution size your display monitor is set to display. For example, most desktop computers display a default screen resolution of 800 x 600 pixels, while laptops are typically set to 1024 x 768 pixels in either 16 or 32-bit color. To find out what your computer display is set at, <mousebutton>right</mousebutton>-click on your desktop, choose <guimenuitem>properties</guimenuitem> and <guimenuitem>settings</guimenuitem>, and read the resolution setting.</para><para>When running &celestia; in Windowed Mode, your screen gives you visible screen borders, sliders and toolbars. You can resize the screen by dragging its corners, minimize the screen, switch between programs, etc. If instead you select a different screen resolution from the <guimenuitem>Display Mode</guimenuitem> pulldown menu, &celestia; will immediately switch to Full Screen Mode, and draw the screen in that pixel size, filling up the entire screen. All of the toolbars, sliders and side borders will disappear.</para><para>High-end computers and those with up-to-date video cards can take advantage of tighter packed pixel sizes and more detailed appearance, and many users prefer to view &celestia; in Full Screen Mode at smaller pixel sizes. The screen is uncluttered and your view really looks like the window in a spacecraft. However, there are disadvantages to Full Screen Mode. First, in order to access the toolbars, you must point your mouse toward the top of the screen and wait for the menu/toolbar to be drawn. With some video cards, the entire screen will go black for a moment as the toolbars are being drawn. Secondly, some screen modes are simply not designed for certain monitors. For example, if you set your resolution at 1280x720 on a regular CRT monitor, the screen will look warped and the planets will be ellipses, not spheres.</para><caution><para>Also, be advised that the ability of &celestia; to redraw complex scenes in different screen sizes varies from system to system. Some users have reported lockups and program crashes when using Full Screen Mode at certain display sizes. We recommend you experiment with your own system and choose the resolution that works best for you. &winfullscreen; (Windows) or &kdefullscreen; (KDE) is a useful keyboard shortcut that toggles between Windowed Mode and Full screen.</para></caution><para><guimenuitem>View Options</guimenuitem> is the 3rd option in the <guimenu>Render</guimenu> menu. Left-click this option to open the View Options dialog box. A list of choices will appear. Deciding which ones you want is a personal and a practical choice. If your computer is a newer model, then we recommend the options listed in the image to the right of this paragraph, and described in detail below. If your computer is slower or older and &celestia; appears to be running slowly, deselect some of these options, as suggested in the following discussion:</para><sect1 id="opt_atmosphere"><title>Atmospheres (&atmospheres;)</title><para>&celestia; will draw colored atmospheres above all planets and moons that have them. You will be able to see them from space and even fly through them. As you do, the sky will lighten. Atmospheres will even dim and turn color as you view them near the terminator (near the dark side).</para><para><emphasis>Highly Recommended</emphasis> - but does require computer resources. Try turning it off if &celestia; is running too slowly on your system.</para><informaltable pgwide="1"><tgroup cols="2"><tbody><row><entry><screenshot><screeninfo>Earth with Atmospheres selected.</screeninfo><mediaobject><imageobject><imagedata fileref="fig4.jpg" format="PNG" /></imageobject><textobject><phrase>Earth with Atmospheres selected.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Earth/2003-03-24T14:39:30.34?x=vr3XsfrEz/GtDA&y=tgu0u7PuJg&z=dengFcStz/Y&ow=-0.798872&ox=-0.219731&oy=-0.380711&oz=-0.410586&select=Sol:Earth&fov=20.349142&ts=1.000000&rf=57239&lm=0">Earth with Atmospheres selected.</ulink></para></caption></mediaobject></screenshot></entry><entry><screenshot><screeninfo>Same scene without Atmospheres selected.</screeninfo><mediaobject><imageobject><imagedata fileref="fig5.jpg" format="PNG" /></imageobject><textobject><phrase>Same scene without Atmospheres selected.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Earth/2003-03-24T14:39:47.87?x=vr3rayPuz/GtDA&y=NWaz3r3uJg&z=dUGgtlNN0/Y&ow=-0.798872&ox=-0.219731&oy=-0.380711&oz=-0.410586&select=Sol:Earth&fov=20.349142&ts=1.000000&rf=56983&lm=0">Same scene without Atmospheres selected.</ulink></para></caption></mediaobject></screenshot></entry></row></tbody></tgroup></informaltable></sect1><sect1 id="opt_celestial_grid"><title>Celestial Grid (&celestialgrid;)</title><para>&celestia; places an equatorial coordinate grid on the screen showing you the celestial position and direction in space. The grid follows the standard convention of Right Ascension and Declination used in Astronomy.</para><para><emphasis>Recommended</emphasis> - when needed to locate a direction in space. For example, you can turn the grid on temporarily to identify direction of an object in &celestia; then go to a real telescope and swing to that approximate coordinate. You can also use the Celestial Grid to help you decide where to place a fictional add-on (see Part 2 of the User's Manual) or to locate an object whose RA and DEC you know from another source.</para><screenshot><screeninfo>Sky with &celestia;l Grid Enabled.</screeninfo><mediaobject><imageobject><imagedata fileref="fig6.jpg" format="PNG" /></imageobject><textobject><phrase>Sky with &celestia;l Grid Enabled.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Earth/2003-03-24T14:40:38.16?x=wzJJcvet1/GtDA&y=mFWLdBuqMg&z=cXerPTw57PY&ow=-0.414948&ox=-0.532151&oy=-0.593261&oz=-0.438948&select=Sol&fov=45.000004&ts=1.000000&rf=57047&lm=0">Sky with &celestia;l Grid Enabled.</ulink></para></caption></mediaobject></screenshot></sect1><sect1 id="opt_clouds"><title>Clouds (&clouds;)</title><para>Some of the planets in our solar system and many fictional planets that &celestia; users create in other solar systems have clouds drifting across their surfaces. &celestia; has the ability to both place clouds above the surface and put them in motion.</para><para><emphasis>Highly Recommended</emphasis> - but does require computer resources. Try turning off if &celestia; is running too slowly or if you just want clear skies.</para><informaltable pgwide="1"><tgroup cols="2"><tbody><row><entry><screenshot><screeninfo>Earth with moving clouds selected.</screeninfo><mediaobject><imageobject><imagedata fileref="fig7.jpg" format="PNG" /></imageobject><textobject><phrase>Earth with moving clouds selected.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Earth/2003-03-24T14:41:28.15?x=1Ct3g+sEIPKtDA&y=GJV89/a89////////////w&z=QbP79kGgovY&ow=0.612877&ox=0.057523&oy=-0.780640&oz=0.108050&select=Sol:Earth&fov=45.000004&ts=1.000000&rf=57239&lm=0">Earth with moving clouds selected.</ulink></para></caption></mediaobject></screenshot></entry><entry><screenshot><screeninfo>Same scene without clouds selected.</screeninfo><mediaobject><imageobject><imagedata fileref="fig8.jpg" format="PNG" /></imageobject><textobject><phrase>Same scene without clouds selected.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Earth/2003-03-24T14:41:49.22?x=1Ct+4WU2IPKtDA&y=PW8EJQO99////////////w&z=QUtZbbH6pvY&ow=0.612877&ox=0.057523&oy=-0.780640&oz=0.108050&select=Sol:Earth&fov=45.000004&ts=1.000000&rf=57223&lm=0">Same scene without clouds selected.</ulink></para></caption></mediaobject></screenshot></entry></row></tbody></tgroup></informaltable></sect1><sect1 id="opt_comet_tails"><title>Comet Tails (&comettails;)</title><para>&celestia; will accurately place a gaseous comet tail behind all comets, properly oriented to always point away from the Sun. To see those tails, you have to be close enough to the comet.</para><para><emphasis>Highly Recommended</emphasis> - but requires computer resources. Try turning off if &celestia; is running too slowly.</para><screenshot><screeninfo>Venus and comet Ikaya-Zhang in Feb, 2002.</screeninfo><mediaobject><imageobject><imagedata fileref="fig9.jpg" format="PNG" /></imageobject><textobject><phrase>Venus and comet Ikaya-Zhang in Feb, 2002.</phrase></textobject><caption><para><ulink url="cel://Follow/Sol:Venus/2002-02-12T09:44:37.36?x=GOVM1fji8HLIDA&y=BDqKmqLy71L//////////w&z=Zbojlky5uPID&ow=0.871985&ox=0.128293&oy=-0.105704&oz=-0.460446&select=Sol:Ikeya-Zhang&fov=11.675808&ts=1.000000&rf=57223&lm=0">Venus and comet Ikaya-Zhang in Feb, 2002.</ulink></para></caption></mediaobject></screenshot></sect1><sect1 id="opt_constellations"><title>Constellations (&constellations;)</title><para>&celestia; will display both constellation shapes and their official "borders" for each of the 88 constellations in the sky. In the second Options row, you can also turn on constellation labels. These 3 options are useful whenever you have an interest in locating a particular constellation in &celestia;.</para><para><emphasis>Recommended</emphasis> - only when desired. Does not use much computer resource.</para><screenshot><screeninfo>Constellations with borders and labels enabled. As viewed from Earth, the Sun is "in" Capricorn.</screeninfo><mediaobject><imageobject><imagedata fileref="fig10.jpg" format="PNG" /></imageobject><textobject><phrase>Constellations with borders and labels enabled. As viewed from Earth, the Sun is "in" Capricorn.</phrase></textobject><caption><para><ulink url="cel://PhaseLock/Sol:Earth/Sol/2003-01-28T21:43:22.11?x=Vm0ZM6hDJ/qzDA&y=TSNET44/wv///////////w&z=pcrvTh/EE9Lz/////////w&ow=-0.260077&ox=-0.143412&oy=-0.945635&oz=0.132543&select=Sol&fov=34.907467&ts=1.000000&rf=65439&lm=8">Constellations with borders and labels enabled. As viewed from Earth, the Sun is "in" Capricorn.</ulink></para></caption></mediaobject></screenshot></sect1><sect1 id="opt_eclipse_shadows"><title>Eclipse Shadows (&eclipseshadows;)</title><para>&celestia; can compute the actual position of the shadows a moon will cast on a planet below as the moon passes in front of the Sun (a solar eclipse). Turning this feature on will cause shadows to be drawn on all planets whenever an eclipse occurs. It is an elegant feature, particularly when observing moon shadows drifting across the giant gas worlds of Jupiter and Saturn.</para><para><emphasis>Highly Recommended</emphasis> - but does require significant computer resources. Note: On some older video cards, eclipse shadows may lock up the program.</para><informaltable pgwide="1"><tgroup cols="2"><tbody><row><entry><screenshot><screeninfo>Io eclipsing Jupiter, an example of Eclipse Shadows.</screeninfo><mediaobject><imageobject><imagedata fileref="fig11.jpg" format="PNG" /></imageobject><textobject><phrase>Io eclipsing Jupiter, an example of Eclipse Shadows.</phrase>⌨️ 快捷键说明
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