星曜为象 · 宫位为境 · 四化为机
紫微斗数是中国古代星象学中的一个分支，以出生年月日时排布十二宫位、安列百余颗星曜， 借由星曜组合与四化变化，构成一套自成体系的语言与图像。本站以文化知识与历史文献为视角， 系统整理其源流、星曜、宫位与四化常识，供传统文化爱好者阅读、学习。
五篇通识，从源流到术语，读完可对紫微斗数的体系有一个完整轮廓。
网页排盘即用即走；需要完整文字解读，可用桌面版或在线解读服务。
浏览器里直接排盘：填出生时间与出生地，自动做真太阳时校正，排出十二宫命盘与四化标注。
正式版安装包，含排盘与完整文字解读，一键安装并在桌面创建快捷方式。
Stars as image · palaces as setting · transformations as motion
Zi Wei Dou Shu is one of the major strands of China's traditional fate-calculation culture. From the year, month, day and hour of birth it lays out twelve palaces and places a hundred-odd stars; through their combinations and the Four Transformations it builds a self-contained language of images. This site takes the view of cultural knowledge and historical sources, and sets out its history, stars, palaces and transformations in order, for readers interested in traditional culture to read and study.
Five primers, from origins to terminology — enough to give a full outline of the system.
From Tang–Song stellar fate lore to the Ming–Qing manuals: how this art formed and spread, and the main classical texts.
星The fourteen major stars, the auxiliaries and the six harmful stars — names, elements and core imagery: the vocabulary of a chart.
宫What each of the twelve palaces governs, their order, and the opposite and trine relations between them.
化Lu, Quan, Ke and Ji: the four changes are the hinge by which stars act on one another, and the key point where schools divide.
入How a chart is actually cast: birth time, the five-element phase, Life and Body palaces, decade and yearly cycles — once through.
器The Windows desktop edition (with the full reading) and its installation notes; for browser charting see "Cast Chart".
Cast a chart in the browser and go; for the full written reading, use the desktop edition or the online service.
Directly in the browser: enter birth time and place, true solar time is corrected automatically, and the twelve-palace chart with transformations is drawn.
The release installer: chart casting plus the full written reading, one-click setup with a desktop shortcut.