Gǔdài de xīngmìngjiā shàncháng gēnjù chūshēng shíchén tuīsuàn mìngyùn.
Ancient astrologers were skilled at calculating fate from one's birth hour.
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星命 specifically refers to fate-reading from celestial positions - most famously 紫微斗数 (Zǐwēi Dǒushù), the Purple Star astrology system, and the older 七政四余. Distinct from 算命先生, who often use birth-character analysis (八字) instead of stars.