Bruno Mars Birth Chart & Zodiac Sign

Bruno Mars was born under the sign of Libra, and that single placement is usually the starting point for any conversation about their astrology. A Sun sign describes the core identity someone tends to circle back to — the traits that show up consistently enough that fans and astrologers alike start pointing them out.

Knowing Bruno Mars's zodiac sign is a useful first read, but it's only one placement out of a full birth chart. The Sun sign describes identity in broad strokes; the fuller picture depends on birth time and location too, which is why this page also looks at what else can be confirmed about their chart below.

Bruno Mars's zodiac sign is Libra, based on their birth date. In a birth chart, the Sun sign is the placement most people mean when they ask "what's your sign," and it represents core identity rather than the full picture. For Bruno Mars, this Sun placement anchors their astrology profile and shapes how their personality tends to come across publicly.

Alongside the Sun, Bruno Mars's Moon sign is Leo. The Moon sign in a natal chart reflects emotional patterns and inner needs rather than outward personality, which is why astrologers treat it as one of the more personal placements to know about someone. Read together with the Sun sign, the Moon sign fills in a side of Bruno Mars's zodiac chart that isn't always visible from public appearances alone.

The third piece of Bruno Mars's big three is their rising sign, or ascendant: Gemini. The rising sign is set by the exact birth time and location, marking the zodiac sign that was ascending on the eastern horizon at the moment of birth. On the natal chart wheel, the rising sign marks the starting point for every house, which is part of why it has such a strong effect on first impressions.

Put together, Bruno Mars's big three — Libra Sun, Leo Moon, Gemini Rising — cover three different layers of personality rather than repeating the same information three times. The Sun sign is identity, the Moon sign is emotional wiring, and the Rising sign is the impression people form before they know anything else.

A Leo Moon points to how Bruno Mars tends to process feelings privately, often differently from how the Libra Sun comes across in public. Meanwhile the Gemini Rising is the first-impression layer — the tone Bruno Mars tends to walk into a room with, before anyone gets to the rest of the chart.

Reading all three placements together, instead of just the Sun sign on its own, is what turns a quick zodiac lookup into an actual birth chart reading.

Chart data uses the Placidus house system, calculated from the reported birth time and location for Bruno Mars.

A Sun sign is calculated from birth date alone, which is why it's the placement that's easiest to confirm publicly. A full birth chart — Moon sign, Rising sign, houses, and aspects between planets — needs an exact birth time and location on top of that, and those details aren't always publicly confirmed for public figures.

For Bruno Mars, a birth time is available, so this page includes Moon sign, Rising sign, and a full chart wheel rather than the Sun sign alone.

Curious how your own placements compare to Bruno Mars's? You can run your exact birth date, time, and place through the free natal chart calculator to get your own Sun, Moon, and Rising signs, or use the Big Three Calculator for a faster side-by-side snapshot.