Sun, Moon and rising sign: what the big three are and how to find yours

Ask most people their sign and they will name one: the one the newspaper column uses. That is the Sun sign, and it is a twelfth of the picture. A birth chart has ten bodies in it, and the three that readers start from are the Sun, the Moon and the point rising in the east. The birth chart calculator puts all three at the top of the result; here is what they are.

The Sun sign

The Sun sign is the zodiac sign the Sun occupied when you were born. Because the Sun takes a year to go round the zodiac, it sits in each sign for about a month, which is why a date alone is enough to know it — nearly. The boundaries are not fixed calendar dates: the Sun enters Aries somewhere between 19 and 21 March depending on the year, and the exact moment shifts by hours each year. Someone born on a boundary date needs the time and the year, not a table.

In Western astrology the Sun sign is read as the core of the character — the self as it wants to be seen. Its degree is printed beside it; a Sun at 0° of a sign was only hours into it.

The Moon sign

The Moon moves through the whole zodiac in about 27 days, so it spends only two and a half days in a sign. Two people born a week apart have the same Sun sign and different Moon signs, which is one reason a Sun-sign horoscope feels like it fits everyone and no one.

The Moon sign is read as the inner life: mood, habit, what feels like home. In Vedic astrology it is the sign — the rashi — and daily readings, matching and muhurta all start from it. Finding it needs the date and at least a rough time, because on about two days in five the Moon crosses into the next sign at some point during the day.

The rising sign

The rising sign, or ascendant, is the sign that was coming up over the eastern horizon at the moment and place you were born. The Earth turns once a day, so the horizon sweeps through all twelve signs in 24 hours: about two hours per sign, though the pace varies with the season and the latitude.

That is why it is the placement that needs the exact time. An hour’s error moves it by about half a sign; if you were born near a boundary, a few minutes decide it. The calculator prints the ascendant’s degree and says when it is within a degree or two of an edge.

The rising sign matters for a second reason: it sets the houses. House 1 is the rising sign, and the rest follow round the wheel, so once the ascendant is known, every planet gets a house — the Sun in the 10th reads differently from the Sun in the 4th. Without it, the chart has signs but no houses, and the tool says so rather than guessing.

Finding all three

Enter your birth date, time and place. The place matters for two things: the time zone, which converts your clock time to the universal time the positions are computed for, and the latitude and longitude, from which the horizon — and so the rising sign — is worked out. The calculator uses the place’s own time-zone history, so daylight saving in force on the day is handled.

The result leads with the three signs, each with its exact degree and house, then the wheel with the ascendant on the left, then every planet in a table. Under that it shows the same Sun and Moon in the Vedic sidereal zodiac, which is why your Vedic sign is usually one earlier. If the Moon sign is what you are after for Indian purposes, the kundli maker gives it with its nakshatra.

What they are not

A sign is a description, not a verdict. The tradition reads the Sun in Leo as a tendency, not a fact about your job or your marriage, and the three together make a sketch rather than a portrait. The rest of the chart — the other planets, the aspects between them, the houses — is where a reading gets specific, and where a chart reader earns their keep. The Jyotish app reads the whole chart and shows the placement behind each sentence, so you can see which of the three it is talking about.