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Typing commands on the keyboard can be tiring and error prone. If you are using Celestia to show the universe to others, a script may be an effective way to tour the stars.
Types of Scripting 
Celestia supports two different Scripting languages, CEL and CELX (Lua). These can be used to add new functionality to the program, or to run educational activities.
CEL scripting 
See the page Celestia/Cel_Scripting
CELX scripting 
See the page Celestia/Celx_Scripting
Other Languages 
You can use any other language you want if it can pass commands to the operating system's command interpreter. It can issue the command to run Celestia and can include on that command line the instruction to run a .CEL Celestia script or .CELX Lua script.
When invoked from a command line, Celestia can be passed the name of a .CEL or .CELX script to run at startup:
./celestia --url name-of-script.cel
When the command line includes the qualifier "--once", the command line will be passed to the running copy of Celestia instead of starting a new copy of the program. (note: use two hyphens)
./celestia --once --url name-of-script.celx
(Starting with Celestia v1.3.1, scripts may be in any folder. Previously they had to be in Celestia's "root" folder.)
External Links 
Visit the Celestia Scripting Forum
Read and contribute to the Celestia Scripting Guide
Many resources for both CEL and CELX scripting can be found at Don G's Celestia Scripting Resources page.