The Emperor (Zi Wei, 紫微) star

What the classic Zi Wei Dou Shu Quan Shu (紫微斗数全书) says it is

Earth, the honoured star of the central heaven, the emperor's seat. It holds the pivot of creation and is the ruler of a life. Leaning on the five phases it raises all things, and by a person's chart it fixes the reckoning. In any palace it brings blessing down and can dissolve a hundred ills. Look at the Three Terraces (三臺) with it: an Emperor star (紫微) holding the Self is the middle terrace, the palace before it the upper and the palace after the lower — see whether they are well placed, and what favourable or ill stars guard and shine on them. Well placed and transformed to good it is very fine; badly placed and transformed to ill, very ill. If the Self meets the Hoard (禄存) in the same palace with the sun and moon shining in trine, the honour is beyond words. Without the Left Aide (左辅) and the Right Aide (右弼) travelling with it, it is a lone ruler — fine jade, and not enough. With malefics in the same palace, or benefics only shining across, the gentleman is in the fields and the small man in office: the person is cunning under a show of goodness, and ill accumulates through the life. Sitting with the trapped (囚) star and no the two Aides (左右) to assist, it makes a clerk. Falling in Health, Siblings, Servants or Appearance — the four weak palaces — it means toil and nothing completed; even help does not make blessing of it. In Career or the Self, those three palaces above all need the two Aides guarding them. With the Minister (天相) and the Hoard and the Steed (禄马) running together, not falling into the Void (空亡), and seated on living ground, it may be read as honour. With the two Patrons (魁钺) and the Three Terraces meeting benefics it makes the Three Terraces and Eight Seats (三臺八座). The emperor meeting the Scholar (文昌) shining across, with a good period supporting it, means a post won by examination. The emperor bringing the General (七杀) down to authority, with a benefic in the same palace, means emperor and minister both have force, all the benefics gathered, and a military post. In Wealth or Property with the two Aides guarding, together with the Moon (太阴) and the Iron (武曲) and no harsh star, it makes an officer of revenue; and with the Iron and the Hoard in the same palace it is more remarkable still in the Self. In Children with favourable assistance, honoured children; alone with no assistance, the children stand few. In Spouse meeting benefics, a fine partner and growing old together — and that too needs no breaking malefic. Travel is a strong palace but still wants assistance. In Wellbeing it is weak ground for a man and strong for a woman: meeting favourable it is favourable, meeting ill it is ill. Master Xiyi (希夷先生) says: The Emperor star is the emperor's seat and in any palace brings blessing and clears calamity, dissolving the ill of the other stars. It can hold the Flare and the Ember (火铃) to good and bring the General down to authority. Getting the Treasury (天府), the Minister, the two Aides, the Scholar and the Artist (昌曲) and the benefics gathered, there is nothing that is not honour; failing that, still great wealth. Even with the four malefics breaking in, judge it a middle chart. Meeting the Disruptor (破军) at Dragon (辰), Dog (戌), Ox (丑) or Goat (未), it means a minister who is not loyal and a son who is not filial. A woman meeting it is judged an honoured wife; with malefics breaking in, still ordinary and not low. The song runs: The Emperor star is Earth by nature, the ruling star of the Career palace; with a minister it is of use, without one it is a lone ruler. In every palace it brings blessing down, and meeting ill the blessing extends itself. The Scholar opens the examinations, the Artist (文曲) receives the imperial favour; for a monk it means a teacher's title and a life passed in ease. With all the stars shining in, a clerk who keeps things fair. If the Blade (擎羊), the Flare (火星) and the Ember (铃星) gather, thieves and pilferers; with benefics in trine, then judge honour. Without the Left Aide and the Right Aide, all the ill drink together and press it down — an emperor without a way to rule, and the cause must be looked into. When the two limits meet the emperor, gladness renews itself. Master Yuchan (玉蟾先生) says: The Emperor star is the ruler of the central heaven, the hinge of all the stars and of creation itself. Broadly it is the ruler of a life, holding the five phases and raising all things, each with its own charge: The Left Aide and the Right Aide as its ministers, the Minister and the Scholar and the Artist as its followers, the two Patrons as its heralds, the sun and moon as its divisions, the Hoard and the Steed as the office of rank, the Treasury as the keeper of the treasury. Meeting it in the Self, the good of it is beyond measure. Meeting the four malefics, the Plunder (地劫), the Sky Void (天空), the Strategist (天机) or the Elder (天梁) breaking in, it is certainly a religious life. This star in the Self makes a person weighty and generous, with a purple cast to the face, and is read as favourable outright.

答曰：紫微屬土，乃中天之尊星為帝座，主掌造化樞機，人生主宰。仗五行育萬物，以人命為之立定數。安星纏各根所司，處年數內常掌爵祿。諸宮降福能消百惡。須看三臺，蓋紫微守命是中臺，前一位是上臺，後一位是下臺。俱看在廟旺之鄉否，有何吉凶之守照。如廟旺化吉甚妙，陷又化凶甚凶。吉限不為美，凶限則凶也。人之身命若值祿存同宮，日月三合相照，貴不可言。無輔弼同行則為孤君，雖美玉不足。更與諸殺同宮，或諸吉合照，君子在野，小人在位。主人奸詐假善，平生惡積。與囚同居，無左右相佐，定為胥吏。如落疾厄、兄弟、奴僕、相貌、四陷宮，主人勞碌作事無成，雖得助亦不為福。更宜詳細宮度，應究星纏之論。若居官祿身命，三宮最要左右守衛。天相祿馬交馳，不落空亡，更坐生鄉，可為貴論。如魁鉞三臺星會吉星。則三臺八座矣。帝會文昌拱照，又得美限扶，必文選之職。帝降七殺為權，有吉同位，則帝相有氣。諸吉咸集，作武官之職。財帛田宅有左右守衛，又與太陰武曲同度，不見惡星，必為財賦之官。更與武曲祿存同宮，身命中尤為奇特。男女宮得祥佐吉星，主生貴子。若獨守無相佐，則子息孤單。妻宮會吉，男女得貴美夫婦諧老，亦要無破殺。遷移雖是強宮，更要相佐，有吉星照命，則因人之貴。福德男為陷地，女為廟樂，逢吉則吉，逢凶則凶。希夷先生曰：紫微為帝座，在諸宮能降福消災，解諸星之惡虛。能制火鈴為善，能降七殺為權。若得府相左右昌曲吉集，無有不貴。不然亦主巨富。縱有四殺沖破亦作中局。若遇破軍在辰戌丑未，主為臣不忠，為子不孝之論。女命逢之作貴婦斷。加殺沖破，亦作平常不為下賤。歌曰紫微原屬土，官祿宮主星，有相為有用，無相為孤君，諸宮皆降福，逢凶福自申，文昌發科甲，文曲受皇恩，僧道有師號，快樂度春秋，眾星皆拱照，為吏協公平，女人會帝座，遇吉事貴人，若與桃花會，擎羊火鈴聚，鼠竊狗偷群，三方有吉拱，方作貴人評，若還無輔弼，諸惡共飲凌，帝為無道主，考究要知因，二限若遇帝，喜氣自然新。玉蟾先生曰：紫微乃中天星主，為眾星之樞紐，為造化也。大抵為人命之主宰，掌五行育萬物，各有所司。以左輔右弼為相，以天相昌曲為從，以魁鉞為傳令，以日月為分司，以祿馬為掌爵之司，以天府為帑藏之主，身命逢之，不勝其吉。如遇四殺（羊陀火鈴）、劫空機梁沖破，定是僧道。此星在命，為人厚重，面紫色，專作吉斷。

One further clause here fixes a woman’s outcome by her sex. It is left out, in the Chinese as well as the English, as everywhere on this site.