Aries opens the zodiac: it is the sign of momentum and the first move. A planet in Aries acts before overthinking, prefers starting over finishing, and moves forward through initiative rather than caution.
This isn't reserved for the Sun sign: the Moon, Venus, or Mars can just as easily fall in Aries in a chart, and will then color emotion, affection, or action with that same energy of a clean, direct start.
Element: Fire. Modality: Cardinal (cardinal signs open each season — Aries opens spring). Ruler (domicile): Mars. Opposite sign: Libra. Natural house: 1 (identity, the way one presents to the world).
The Sun is in exaltation here (around 19°): a position traditionally judged favorable. By contrast, Saturn is in fall here — Saturnian caution expresses itself poorly, held back by the urgency proper to the sign.
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