The "Big Three" of a Western natal chart are the Sun sign (core identity, what you are becoming), the Moon sign (inner emotional life, what you need to feel safe), and the Rising sign / Ascendant (the mask, how you first show up). Popular astrology often treats them as the headline of a chart, while the full chart includes seven other planets, 12 houses, and dozens of aspects. Knowing your Big Three requires accurate birth time.
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Western · Glossary
Big Three
Sun sign, Moon sign, and Rising sign — the three most-asked-about placements.