This file is indexed.

/usr/share/celestia/controls.txt is in celestia-common 1.6.1+dfsg-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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  Celestia Mouse, Keyboard and Joystick Controls


------------------------------------------
    MOUSE CONTROLS
------------------------------------------
 Left Drag ................................. Orient camera
 Right drag ............................... Orbit selected object [Shift+Arrow keys]
 Left+Right Drag left/right ........ Roll view left/right [Left/Right arrows]
 Left+Right Drag up/down ....... Adjust distance to selection [Home/End]
 Wheel ..................................... Adjust distance to selection [Home/End]
 Ctrl+Left Drag up/down .......... Adjust distance to selection [Home/End]
 Shift+Left Drag ....................... Change Field of View (FOV) [. / ,]
 Middle Button ......................... Toggle FOV between 45 degrees and previous setting
 Left Click (on object) .............. Select object [Enter key -- by object name]
 Left Click (on no object) ......... Cancel selection
 Left Double Click (on object) ...Select and Center object
 Right Click .............................. Bring up context menu


------------------------------------------------
    KEYBOARD CONTROLS
------------------------------------------------

--- Navigation ---

 1 - 9 .................................. Select planet around the nearest star
 0 (zero) ............................. Select parent star of current planet or system
 H ...................................... Select Sol (Home system)
 C ....................................... Center on selected object
 G ...................................... Goto selected object
 F ....................................... Follow selected object
 T ....................................... Track selected object
 Y ....................................... Sync Orbit selected object at a rate synced to its rotation
 : ........................................ Lock on selected object
 " ........................................ Chase selected object
 Shift+C .............................. Center/orbit --center the selected object without changing
                                            the position of the reference object
 Ctrl+G ............................... Goto surface of selected object
 Ctrl+F ................................ Toggle Alt-azimuth mode
 Home ................................ Move closer to object
 End ................................... Move further away from object
 * ........................................ Look back
 Backspace ....................... Select parent of current object or clear the selection
 Esc ................................... Cancel motion or script


--- Time Control ---

 Spacebar .......................... Pause/Resume the flow of time and scripts (toggle)
 J ....................................... Reverse/Forward time (toggle)
 \ ....................................... Set time rate: 1x forward (norm), cancels faster/slower x factors
 L ....................................... Change time rate: 10x faster
 K ....................................... Change time rate: 10x slower
 Shift+L .............................. Change time rate: 2x faster
 Shift+K .............................. Change time rate: 2x slower
 ! ........................................ Set time to current system date and time
 ? ....................................... Display light-travel delay between observer / selected object
 - (hyphen).......................... Subtract light-travel delay from current simulation time


--- Labels (on/off Toggles) ---

E ...................................... Galaxies
Shift+E ............................. Globulars
B ...................................... Stars
P ...................................... Planets
Shift+P ............................. Dwarf Planets
M ...................................... Moons
Shift+M ............................. Minor Moons
W ..................................... Asteroids
Shift+W ............................ Comets
N ...................................... Spacecraft
= ....................................... Constellations
& ....................................... Locations


--- Render/Display (on/off Toggles) --

 U ..................................... Galaxies
 Shift+U ............................ Globulars
 ^ ...................................... Nebulae
 Ctrl+A .............................. Atmospheres
 I ....................................... Clouds
 Ctrl+L ............................... Night side maps
 Ctrl+T ............................... Comet tails
 Ctrl+E ............................... Eclipse shadows
 Ctrl+B ............................... Constellation boundaries
 / ....................................... Constellation diagrams
 ; ........................................ Earth-based equatorial coordinate sphere
 Ctrl+K ............................... Markers (placed on objects)
 O ...................................... Orbits (toggle ALL selected orbits)


--- Render Options ---

 { ....................................... Decrease Ambient Light
 } ....................................... Increase Ambient Light
 ( ....................................... Decrease Galaxy Light Gain
 ) ....................................... Increase Galaxy Light Gain
 [ ....................................... Decrease Magnitude Limit :
                                           - If AutoMag OFF: Decrease limiting magnitude (fewer stars)
                                           - If AutoMag ON : Decrease limiting magnitude at 45 deg FOV
 ] ....................................... Increase Magnitude :
                                           - If AutoMag OFF: Increase limiting magnitude (more stars)
                                           - If AutoMag ON : Increase limiting magnitude at 45 deg FOV
 Ctrl+Y ............................... Toggle Auto Magnitude (auto adaptation of star visibility to FOV
 , ....................................... Narrow Field Of View [Shift+Left Drag]
 . ....................................... Widen Field Of View [Shift+Left Drag]
 Ctrl+X ............................... Toggle Antialias lines
 Alt+Enter .......................... Toggle Display mode (Full-Screen / Windowed)
 Ctrl+P ............................... Mark selected object
 Ctrl+V ............................... Cycle among supported OpenGL render paths
 + ...................................... Toggle Planet Texture type (Artistic / Limit of Knowledge)
 % ..................................... Star color table toggle
 Ctrl+S ............................... Cycle the Star Style (points / fuzzy discs / scaled discs)
 V ...................................... Cycle the Info text verbosity (None / Terse / Verbose)
 Ctrl+W .............................. Toggle Wireframe mode


--- Multiview Options ---

Ctrl+U ................................ Split view horizontally
Ctrl+R ................................ Split view vertically
Tab ................................... Cycle through all active views
Del .................................... Delete active view
Ctrl+D ................................ Delete all views except active one (reset to Single view)


--- Navigation via Arrow Keys ---

 Up/Down Arrow ................. Pitch down/up
 Left/Right Arrow ................. Roll left/right
 Shift+Left/Right Arrow ........ Orbit object: right/left
 Shift+Up/Down Arrow ........ Orbit object: down/up

 
--- Navigation via number Pad Keys (with NumLock active) ---

 8 ...................................... Pitch down [Down arrow]
 2 ...................................... Pitch up [Up arrow]
 7 ...................................... Roll left  [Left arrow]
 9 ...................................... Roll right [Right arrow]
 5 ...................................... Stop rotation
 4 ...................................... Yaw left
 6 ...................................... Yaw right


--- Motion (Spaceflight) ---

 Z ...................................... Decrease velocity
 A ...................................... Increase velocity
 Q ...................................... Reverse direction
 X ...................................... Set movement direction toward center of screen
 F2 .................................... Set velocity to 1 km/second
 F3 .................................... Set velocity to 1,000 km/second
 F4 .................................... Set velocity to speed of light (1 c)
 F5 .................................... Set velocity to 10x the speed of light (10 c)
 F6 .................................... Set velocity to 1 AU/second
 F7 .................................... Set velocity to 1 light year/second
 F1 .................................... Stop motion
 S ...................................... Stop motion

--- Other Functions ---

 Ctrl+C .............................. Copy location URL to clipboard (Cel:// URL)
 Ctrl+Insert ........................ Copy location URL to clipboard (Cel:// URL)
 F10 .................................. Capture Image to file (screenshot)
 Shift+F10 ......................... Capture Movie to file (video)
 F11 .................................. While in Movie Capture: Start / Pause capture
 F12 .................................. While in Movie Capture: Stop capture
 ~ ..................................... Toggle debug console (use Up/Down arrow keys to scroll list)
 ` ...................................... Toggle display of "frames per second" (FPS) being rendered
 Ctrl+O .............................. Display "Select Object" dialog box
 @ .................................... Edit Mode toggle (to assist in the placement of objects)
 D ..................................... Run demo script (/celestia/demo.cel)
 Enter ............................... Toggle Name entry Mode (use Tab / Shift+Tab to highlight
                                          an item, Esc to exit)


--------------------------------------------
    JOYSTICK CONTROLS
--------------------------------------------
 F8 .................................... Toggle Joystick control
 X axis ............................... Yaw Left/Right
 Y axis ............................... Pitch Up/Down
 L trigger ............................ Roll Left
 R trigger ........................... Roll Right
 Button 1 ........................... Move slower
 Button 2 ........................... Move faster