<chapter id="using-kstars">
<title>A Quick Tour of &kstars;</title>

<para>
This chapter presents a guided tour of &kstars;, introducing
many of its important features.
</para>

<screenshot>
<screeninfo>
Here is a screenshot of the &kstars; main window:
</screeninfo>
<mediaobject>
  <imageobject>
    <imagedata fileref="screen1.png" format="PNG"/>
  </imageobject>
  <textobject>
    <phrase>Main Window</phrase>
  </textobject>
</mediaobject>
</screenshot>

<para>
The above screenshot shows a typical view of the &kstars; program.  You
can see the sky display centered on Betelgeuse, the brightest star in
the constellation Orion.  Orion has just risen above the eastern horizon.
Stars are displayed with <link linkend="ai-colorandtemp">realistic
colors</link> and relative brightnesses.  In three corners 
of the sky display, there are on-screen text labels displaying data on 
the current time (<quote>LT: 20:16:09 Tuesday 23 November 2010</quote>), the current 
Geographic Location (<quote>Fremont, California, USA</quote>), and the 
current object in the center of the display (<quote>Focused on: Betelgeuse 
(alpha Orionis)</quote>).  Above the sky display, there are two toolbars.  
The main toolbar contains shortcuts for
<link linkend="kstars-menus">menu functions</link>, as well as a
time-step widget which controls how fast the simulation clock runs.
The view toolbar contains buttons that toggle the display of different
kinds of objects in the sky.  At the bottom of the window, there is a
status bar which displays the name of any object you click on, and the
<link linkend="ai-skycoords">sky coordinates</link> (both
Right Ascension/Declination and Azimuth/Altitude) of the mouse cursor.
</para>

<sect1 id="startwizard">
<title>The Setup Wizard</title>
<para>
<indexterm><primary>Setup Wizard</primary></indexterm>
The first time you run &kstars;, you will be presented with a Setup Wizard,
which allows you to easily set your geographic location and download some
extra data files.  You can press the <guilabel>OK</guilabel> button
at any time to exit the Setup Wizard.
</para>

<para>
The second page of the Setup Wizard allows you to choose the starting
geographic location, by selecting from the list of the 2500+ known
locations on the right side of the window.  The list of locations can be
filtered to match the text you enter in the <guilabel>City</guilabel>,
<guilabel>Province</guilabel>, and <guilabel>Country</guilabel> edit
boxes.  If your desired location is not present in the list, you can
select a nearby city instead for now.  Later on, you can add your
precise location manually using the <link linkend="setgeo">Set Geographic
Location tool</link>.  Once you have selected a starting location, press
the <guilabel>Next</guilabel> button.
</para>

<para>
The last page of the Setup Wizard allows you to download extra data
that are not included with the standard distribution of &kstars;.
Simply press the <guilabel>Download Extra Data</guilabel> button to open
the <guilabel>Get New Stuff</guilabel> tool.  When you are all done,
press the <guilabel>OK</guilabel> button in the Setup Wizard to
start exploring &kstars;.
</para>
</sect1>

<sect1 id="lookaround">
<title>Have a Look Around</title>
<para>
<indexterm><primary>Navigation Controls</primary>
<secondary>Basics</secondary></indexterm>
Now that we have the time and location set, let us have a look around.
You can pan the display using the arrow keys.  If you hold down the
&Shift; key before panning, the scrolling speed is increased.  The
display can also be panned by clicking and dragging with the mouse.
Note that while the display is scrolling, not all objects are
displayed.  This is done to cut down on the <acronym>CPU</acronym> load
of recomputing object positions, which makes the scrolling smoother
(you can configure what gets hidden while scrolling in the <link
linkend="config">Configure &kstars;</link> window).

There are several ways to change the magnification (or
<firstterm>Zoom level</firstterm>) of the display:</para>

<orderedlist>
<listitem>
	<para>Use the <keycap>+</keycap> and
	<keycap>-</keycap> keys</para>
</listitem>
<listitem>
	<para>Press the Zoom In/Zoom Out buttons in the toolbar</para>
</listitem>
<listitem>
	<para>Select
	<guimenuitem>Zoom In</guimenuitem>/<guimenuitem>Zoom Out</guimenuitem>
	from the <guimenu>View</guimenu> menu</para>
</listitem>
<listitem>
	<para>Select <guimenuitem>Zoom to Angular Size...</guimenuitem> from
	the <guimenu>View</guimenu> menu.  This allows you to specify 
	the field-of-view angle for the display, in degrees.</para>
</listitem>
<listitem>
	<para>Use the scroll wheel on your mouse</para>
</listitem>
<listitem>
	<para>Drag the mouse up and down with the &MMB; pressed.</para>
</listitem>
<listitem>
	<para>Hold down &Ctrl; while dragging the mouse.  This
	will allow you to define a rectangle in the map.  When you release the mouse
	button, the display will zoom to match the rectangle.</para>
</listitem>
</orderedlist>

<para>Notice that as you zoom in, you can see fainter stars than at
lower zoom settings.</para>

<para>
Zoom out until you can see a green curve; this represents your local
<link linkend="ai-horizon">horizon</link>.  If you have not adjusted
the default &kstars; configuration, the display will be solid green
below the horizon, representing the solid ground of the Earth.  There
is also a white curve, which represents the <link
linkend="ai-cequator">celestial equator</link>, and a brown curve, which
represents the <link linkend="ai-ecliptic">Ecliptic</link>, the path
that the Sun appears to follow across the sky over the course of a
year.  The Sun is always found somewhere along the Ecliptic, and the
planets are never far from it.
</para>
</sect1>

<sect1 id="skyobjects">
<title>Objects in the Sky</title>
<para>
<indexterm><primary>Objects in the Sky</primary>
<secondary>Overview</secondary></indexterm>
&kstars; displays thousands of celestial objects: stars, planets,
comets, asteroids, clusters, nebulae and galaxies.  You can interact
with displayed objects to perform actions on them or obtain more
information about them.  Clicking on an object will identify it in the
status bar, and simply hovering the mouse cursor on an object will label
it temporarily in the map.  Double-clicking will recenter the display on
the object and begin tracking it (so that it will remain centered as
time passes).  <mousebutton>Right</mousebutton> clicking an object opens
the object's popup menu, which provides more options.
</para>

<sect2 id="popupquick">
<title>The Popup Menu</title>
<indexterm><primary>Popup Menu</primary><secondary>Example</secondary></indexterm>

<para>
Here is an example of the <mousebutton>right</mousebutton> click popup
menu, for the Orion Nebula:
</para>

<screenshot>
<screeninfo>Popup Menu for M 42</screeninfo>
<mediaobject>
  <imageobject>
    <imagedata fileref="popup.png" format="PNG"/>
  </imageobject>
  <textobject>
    <phrase>Popup Menu for M 42</phrase>
  </textobject>
</mediaobject>
</screenshot>

<para>
The appearance of the popup menu depends somewhat on the kind of
object you <mousebutton>right</mousebutton>-click on, but the basic
structure is listed below.  You can get
<link linkend="popup-menu">more detailed information about the popup
menu</link>.
</para>

<para>
The top section contains some lines of information which are not
selectable: the object's names ("M 42"; "Orion Nebula"),
object type ("gaseous nebula"), and the constellation
which contains the object ("Orion").  The next three lines show the 
object's rise, set, and transit times.  If the rise and set times 
say "circumpolar", it means that the object is always above the 
horizon for the present location.
</para>
<para>
The middle section contains actions which can be performed on the
selected object, such as <guimenuitem>Center &amp; Track</guimenuitem>,
<guimenuitem>Details...</guimenuitem>, and
<guimenuitem>Attach Label</guimenuitem>.  See the <link 
linkend="popup-menu">popup menu description</link> for a full list 
and description of each action.
</para>
<para>
<indexterm><primary>Objects in the Sky</primary>
<secondary>Internet Links</secondary>
<seealso>Popup Menu</seealso></indexterm>
The bottom section contains links to images and/or informative webpages
about the selected object.  If you know of an additional &URL; with
information or an image of the object, you can add a custom link to the
object's popup menu. Use the <guimenuitem>Details</guimenuitem> item in 
the popup menu to open the <guilabel>Object Details</guilabel> dialog. 
On the <guilabel>Link</guilabel> tab use the <guimenuitem>Add Link...</guimenuitem> 
item.
</para>
</sect2>

<sect2 id="findobjects">
<title>Finding Objects</title>
<indexterm><primary>Find Object Tool</primary></indexterm>
<indexterm><primary>Objects in the Sky</primary>
<secondary>Finding by Name</secondary></indexterm>
<para>
You can search for named objects using the <guilabel>Find
Object</guilabel> tool, which can be opened by clicking on the
<guiicon>search</guiicon> icon in the toolbar, by selecting
<guimenuitem>Find Object...</guimenuitem> from the
<guimenu>Pointing</guimenu> menu, or by pressing
<keycombo action="simul">&Ctrl;<keycap>F</keycap></keycombo>.
The <guilabel>Find Object</guilabel> window is shown below:

<screenshot>
<screeninfo>Find Object Window</screeninfo>
<mediaobject>
  <imageobject>
    <imagedata fileref="find.png" format="PNG"/>
  </imageobject>
  <textobject>
    <phrase>Find Object Window</phrase>
  </textobject>
</mediaobject>
</screenshot>
</para>

<para>
The window contains a list of all the named objects that &kstars; is
aware of.  Many of the objects only have a numeric catalog name (for
example, NGC 3077), but some objects have a common name as well (for
example, Whirlpool Galaxy).  You can filter the list by name and
by object type.  To filter by name, enter a string in the edit box
at the top of the window; the list will then only contain names
which start with that string.  To filter by type, select a type
from the combo box at the bottom of the window.
</para><para>
To center the display on an object, highlight the desired object in
the list, and press <guibutton>Ok</guibutton>.  Note that if the
object is below the horizon, the program will warn you that you may
not see anything except the ground (you can make the ground invisible
in the <guilabel>Guides</guilabel> settings page, or by pressing the
<guiicon>Ground</guiicon> button in the View toolbar).
</para>
</sect2>

<sect2 id="centertrack">
<title>Centering and Tracking</title>
<indexterm><primary>Objects in the Sky</primary>
<secondary>Tracking</secondary></indexterm>
<para>
&kstars; will automatically begin tracking on an object whenever one
is centered in the display, either by using the <guilabel>Find
Object</guilabel> window, by double-clicking on it, or by
selecting <guimenuitem>Center &and; Track</guimenuitem> from its
<mousebutton>right</mousebutton>-click popup menu.  You can disengage
tracking by panning the display, pressing the <guiicon>Stop Tracking</guiicon>
icon in the Main toolbar, or selecting <guimenuitem>Stop Tracking</guimenuitem> 
from the <guimenu>Pointing</guimenu> menu.
</para>

<note>
<para>
<indexterm><primary>Orbit Trails</primary>
<secondary>Attached to centered object</secondary>
</indexterm>
When tracking on a Solar System body, &kstars; will automatically
attach an <quote>orbit trail</quote>, showing the path of the body
across the sky.  You will likely need to change the clock's timestep
to a large value (such as <quote>1 day</quote>) to see the trail.
</para>
</note>
</sect2>

<sect2 id="objectactions">
<title>Keyboard Actions</title>
<indexterm><primary>Objects in the Sky</primary>
<secondary>Keyboard Actions</secondary></indexterm>
<para>

When you click on an object in the map, it becomes the
<firstterm>selected object</firstterm>, and its name is identified in
the statusbar.  There are a number of quick key commands available
which act on the selected object:

<variablelist>
<varlistentry>
<term><keycap>C</keycap></term>
<listitem>
<para>Center and Track on the selected object</para>
</listitem>
</varlistentry>

<varlistentry>
<term><keycap>D</keycap></term>
<listitem>
<para>Show the <link linkend="tool-details">Details window</link> 
for the selected object</para>
</listitem>
</varlistentry>

<varlistentry>
<term><keycap>L</keycap></term>
<listitem>
<para>Toggle a visible name label on the selected object</para>
</listitem>
</varlistentry>

<varlistentry>
<term><keycap>O</keycap></term>
<listitem>
<para>Add the selected object to the 
<link linkend="tool-observinglist">Observing List</link></para>
</listitem>
</varlistentry>

<varlistentry>
<term><keycap>T</keycap></term>
<listitem>
<para>Toggle a visible curve on the sky, showing the path of the 
object across the sky (only applicable to Solar System bodies)
</para>
</listitem>
</varlistentry>

</variablelist>
</para>

<note>
<para>
By holding down the &Shift; key, you can perform 
these actions on the centered object, rather than the selected 
object.
</para>
</note>
</sect2> <!--object actions-->
</sect1> <!--objects in the sky-->

<sect1 id="endtour">
<title>End of the Tour</title>
<para>
This concludes the tour of &kstars;, although we have only scratched
the surface of the available features.  &kstars; includes many useful
<link linkend="tools">astronomy tools</link>, it can directly
<link linkend="indi">control your telescope</link>, and it offers a
wide variety of <link linkend="config">configuration and
customization options</link>.  In addition, this Handbook includes the
<link linkend="astroinfo">AstroInfo Project</link>, a series of short,
interlinked articles explaining some of the celestial and astrophysical
concepts behind &kstars;.
</para>
</sect1>

</chapter>
