紫微星是紫微斗數名稱的由來，象徵皇帝，五行屬土。
前文提過斗數是一種語言，我們把星矅的意義當作詞語，組合成一句句子來推算性格及命運。關於紫微的關鍵字，是喜惡隨心，任性和霸氣。切記不要將紫微在命直接當成皇帝命，我們推算時所說的地位，主星小星，都是指性格特點，而不直接反映在社會地位上。
紫微的兄弟宮是天機，為十四主星中最畏煞的主星，主星中的小星。自古一山不能藏二虎，皇帝只有一個，能成功跟皇帝稱兄道弟，或者其親兄弟，自然不能有要求，不能有其他意見，只可以是唯唯諾諾的天機。
紫微的父母宮為空宮，代表紫微之上再沒有上級人物。紫微的霸氣任性，可以令他以為自己沒有父母，而是受命於天，不喜歡聽取上級的意見。以紫微作命宮的人，如工作環境中，上司給予自由度和決策機會不足，還是盡快另謀高就比較好。
紫微的財帛宮是武曲，為紫微的價值觀。皇帝作為決策者，喜歡想做就做，一點不拖延，所以價值宮是代表短慮和執行的武曲。還要補充一下，我們不要把武曲當成財星，認為財星在財帛宮就是富貴命，星矅的解釋都反映性格，而不直接反映地位和收入。
紫微的事業宮是廉貞。紫微的理想遠大，體現在建立關乎倫理，典章制度的層面上，而較少考慮現實和利益。
紫微星具有自尊，認為自己可以作主，與別不同，有時會目中無人，所以也會努力取得較高的社會地位、學歷和專業資格等。
既然解釋紫微時我們取其霸氣，喜惡隨心，因此紫微不適合經商，我們分析過幾個富人的命例，也不以紫微在命。經營生意固然可以凡事自己決定，不再受上級使喚，符合紫微的性格，但經營生意並非純粹任意而行，而需要更多小心計算，面對困難，需要靈活變通；生意走上軌道，需要謹慎守業。因此紫微在命的話，一般不適合營商。
此外，紫微也不適合做學術研究。紫微高傲，個人想法強，不易接受新事物，容易快速下結論，於是不適合做學術研究。可是，不少古書卻說紫微在命可成讀書人，如得昌曲會照更代表高學歷。我們需要對現實有更細緻的認識，能讀書不代表能做研究，紫微旺也有考取證書，取得高學歷的可能，現代可考慮管理一類學位，重點是取得證書，而不是學習職業技能，因為紫微固執，喜歡按自己一套辦事，取得證書後再按自己意願做管理工作，才最適合紫微的特性。
既然紫微星具有決策能力，與他最適配的副星就是左輔、右弼、三台和八座等，有關幫助的星矅。由於紫微的目標傾向精神層面，比較理想化，很多時是領袖一類角色，需要他人執行和幫助，才能成功。不過根據安星法，能會齊左輔右弼的，只有紫破同宮和紫相同宮，兩者均帶有親力親為的成份，所以紫微斗數告訴我們，最成功的老闆，企業總裁，只有那些既以身作則，參與業務營運，他的理想和大計劃，才有可能被其他員工接受和實行。
紫微既為皇帝，駕煞能力較高，與一些煞星同宮或會照，可謂無傷大雅。我們要明白紫微斗數中，所有主星副星人人皆有之，永不落空，只有分配給誰的分別。紫微相比其他主星，較不需要吉星扶持，也較不怕煞星破壞，所以昌曲雖然可提高紫微的學歷，但只是錦上添花，不如分給巨門提高修養。同理，紫微會照擎羊，令作風更為強橫；會照陀羅，增其固執；會照火星，脾氣暴躁；會照鈴星，為人固執。但這些特點，相對之下還是較易接受。
較差的組合為紫微祿存同宮，上述紫微忽視上級，只能接受朋友認同。祿存同宮的話，父母宮必為擎羊，兄弟宮必為陀羅，於是六親互相爭奪競爭，關係不和。
紫微作為紫微斗數第一顆出場的主星，受到關注自然較多，希望本文可以讓讀者重新認識紫微星，避免對紫微星再有太多幻想。
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