Celestia是一个免费的开放源代码天文类软件,通过它你不仅可以鸟瞰地球,还可以畅游太阳系,以及其它多达10万颗星,甚至是银河系以外的星座.你可以远观星云,也可以近看飞行器.所有的查看和缩放都非常平滑.Celestia 包含了巨大的天文数据库,包括恒星,行星,卫星,彗星以及太空船;如果原带的这些库还不能满足你,你可以方便的下载和安装扩展信息库.Celestia虽然是英文软件,但操作并不复杂,甚至可以通过快捷键控制.[F8>开始运行,按1～9是快捷键,代表九大行星,再按“G”可以飞到你想要的行星了.空格键是暂停和恢复.“K”和“L”是时间加速和减速.“O”是显示轨道.上下左右控制方向.

v1.5.1
* Added fonts for Russian, Chinese, and Japanese
* Updated translations
* Fixed date formatting for non-UTF8 locales
* Fixed crash for dates prior to JD -1.5 when local format is used
* Fixed star rendering for Macs with ATI graphics hardware (worked around
a driver bug in point sprite support.)
* Fixed star glare clipping bug
* Fixed bug that caused some stars to be drawn untextured
* Fixed faster/slower options in the Windows time menu to adjust time by
10x instead of 2x
* Fixed translation of time acronyms DST and STD
* Use localized versions of start script, guide, demo, license, and controls
file from locale directory
* Fixed Windows 98/ME input problem; most keyboard commands weren't working on
the OSes.
* Made Lua os functions available from celx scripts when access policy is "ask"


官网：http://www.shatters.net/celestia/

官方下载：
Windows：http://prdownloads.sourceforge.net/celestia/celestia-win32-1.5.1.exe?download
Mac OS X：http://prdownloads.sourceforge.net/celestia/celestia-osx-1.5.1.dmg?download
Linux：http://prdownloads.sourceforge.net/celestia/celestia-gtk-1.4.1.x86.package?download v1.4.1
源码：http://prdownloads.sourceforge.net/celestia/celestia-1.5.1.tar.gz?download