Sun Sign Calculator

Your sun sign is the zodiac sign the Sun was passing through at the moment you were born. It's set by your date of birth, and near a sign change, by your birth time. The Sun spends about a month in each sign, so your birthday points to one of the twelve. In astrology it stands for your core identity and vitality.

This is the placement people mean when they say they're a Leo, or ask what your sign is. It's the anchor of the chart, and the first thing to know before you read your Moon, your Rising sign, or anything else.

For most birthdays, no. The Sun stays in one sign for about a month, so unless you were born close to the start or end of a sign, your date alone gives a definite answer. The Sun moves through the zodiac slowly and predictably, and a lookup by date lands the right sign the great majority of the time.

The exception is the boundary. The Sun changes signs at an exact moment, and that moment shifts by roughly a day from year to year, because it tracks an astronomical event rather than a fixed calendar date. If your birthday falls within about a day of a sign change, your birth time and place decide which sign you got. That's the only case where a sun sign needs more than a date. Your Moon, your Rising sign, and your houses always need the full birth time and place.

No. The Sun occupies one sign at a time, so nobody has two sun signs. The word cusp describes a birthday that lands near the change from one sign to the next, usually within a couple of days. It can feel like a blend, and there's a real reason for that, but the blend isn't a second Sun.

What you're feeling is usually the rest of your chart. If your Sun sits in the last degrees of Cancer while your Moon, Venus, or Mars is in Leo, you'll read as part Leo, because you are, just not by your Sun. The way to settle a cusp birthday is to compute the Sun's exact position at your birth moment, which is what this calculator does once you add your time. One sign comes back, with certainty.

In a birth chart, the Sun is the center. It stands for your core vitality, the direction you're growing toward, and the part of your life where you're built to shine. Ancient astrologers treated it as the source of life in the chart, and that framing still holds up: the Sun's sign and house show where your energy wants to go and how it comes out.

Two things sharpen the reading. The first is the house the Sun falls in, which points to the area of life where the solar story plays out, career, relationships, home, or learning. A Leo Sun in the tenth house shines through public work; the same Leo Sun in the fourth shines at home and through family. The second is sect. If you were born during the day, the Sun is the sect light, the leading planet of a daytime chart, and it carries extra weight. A night birth hands that leading role to the Moon, and the Sun reads a little more quietly. This is why two people with the same sun sign can wear it so differently, and why the sign is the start of the reading rather than the whole of it. For the house and the aspects, run your full birth chart.

Your sun sign is one of three placements people mean by the Big Three. The Sun is your core identity and vitality. Your Moon sign is your emotional interior, what you need to feel safe and how you process what you feel. Your Rising sign, the Ascendant, is the approach and the first impression, the version of you that meets the world before anyone knows the rest.

Sun tells you what you're growing toward. Moon tells you what you're made of underneath. Rising tells you how you come across before either one shows. You need a birth time for the Moon sometimes and for the Rising sign always, which is why the Sun, Moon and Rising calculator asks for more than a date. If you already have your sun sign, the moon sign calculator and the rising sign calculator are the next two to run.

It can be, and often it is. Western astrology uses the tropical zodiac, which starts at the spring equinox and ties the signs to the seasons. Vedic astrology uses the sidereal zodiac, pinned to the actual constellations. Over the last two thousand years the two have drifted about 24 degrees apart, an effect called precession, and the gap keeps widening slowly.

The practical result: most people's sidereal Sun sits one sign earlier than their tropical Sun. Someone with an early tropical Aries Sun usually reads as Pisces in the sidereal scheme. Neither is wrong; they answer different questions, one seasonal and one constellational. If you want your Vedic placement, the sidereal chart calculator does that math with the Lahiri correction most Vedic astrologers use.