Jupiter In Aries. Jupiter’s natural optimism and fiery enthusiasm sits comfortably and positively when the planet is in this sign. It adds an independent and freedom-loving quality to the nature. Here too is adventurousness, and a pioneering spirit which will also encourage sportsmanship and the Aries need to win, to be first, to be way out in front of one’s rivals. There will be a quality of quick decisiveness which can sometimes lead to premature action. There is increased accidentproneness and a tendency to sometimes take unnecessary risks; but equally the intellectual and studious side of Jupiter will find fascinating expression.