Lagna Calculator

A point that sweeps the whole zodiac once a day

The Earth's rotation carries all twelve signs past the eastern horizon in a day, so the lagna runs through the entire zodiac in about twenty-four hours: on average a sign every two hours, a degree every four minutes. The Moon, by comparison, needs more than two days to cross a single sign. Shift the recorded birth time by fifteen minutes and the rising degree moves by nearly four degrees, which is enough to change its nakshatra pada and, close to the edge of a sign, the rising sign itself.

The signs do not come up at an even pace. Because the zodiac is tilted against the celestial equator, some signs rise at a slant and pass quickly while others climb almost upright — astrologers speak of signs of short and long ascension — and the contrast grows with latitude. At Channarayapatna, about 13° north, a sidereal sign takes from roughly an hour and forty minutes (Pisces) to a little over two hours and ten minutes (Scorpio) to rise; at Delhi, from under an hour and a half for Pisces to about two and a third hours for Cancer.

What the result reports, and how its houses are counted

The result names the rising sign in English, Sanskrit and Hindi, the degree on the horizon, and the nakshatra and pada containing that degree — the lagna's own star, usually not the Moon's. It then names the lagna lord, the planet owning the rising sign, with the sign it occupies and that sign's house from the lagna, and lists the sign's element and quality: Scorpio, for instance, is fixed water.

Houses here are counted sign by sign, which is how a lagna kundli is drawn in both the North Indian diamond and the South Indian square: the whole rising sign is the first house, the whole of the next sign the second, and so on. Some readers instead measure houses from the exact lagna degree, so that each house straddles two signs, and under that bhava convention a planet late in a sign can be counted in the following house. The house number on this page is always the sign-based one.

The first house in Parashara's scheme

Brihat Parasara Hora Sastra sets out the character of the twelve signs in chapter 4 and gives chapter 12 to the effects of the first house. In outline, the first house stands for the person themself — the body, its build and bearing, and the general sense of wellbeing — and Parashara judges it through three things taken together: the sign rising, the strength and position of its lord, and the planets that occupy or aspect the lagna.

Chapter 7, which lists what each divisional chart is for, begins with the physique and reads it from the lagna. Every divisional chart has a rising point of its own too, which is why the lagna is treated as the anchor of a Vedic chart rather than as one placement among many: change it and every house in every chart is renumbered.

The worked example, degree by degree

In the illustrative chart the lagna is Scorpio 11°23′ — Vrishchika, वृश्चिक in Hindi. Anuradha covers Scorpio 3°20′ to 16°40′ and its third pada runs from 10°00′ to 13°20′, so the rising degree sits in Anuradha pada 3. Scorpio belongs to Mars, which makes Mars the lagna lord, and Mars is found in Scorpio itself, at 27°54′: the lord occupies its own sign, the rising sign, the first house.

The chart also allows a check that needs no software. The Sun is at Scorpio 27°25′, in the rising sign but some sixteen degrees further along than the lagna — meaning it had not yet cleared the horizon. At that latitude Scorpio rises at roughly four and a half minutes a degree, so sixteen degrees is a little over seventy minutes, and the birth panchang puts sunrise that morning at 06:40:53, seventy-one minutes after the 05:30 birth.

The same arithmetic shows the size of the window. Scorpio had begun rising a little under an hour before the birth and would hand over to Sagittarius about eighty minutes after it, so the sign survives a generous error in the recorded time. The pada does not: the lagna stood barely a degree and a half inside Anuradha's third quarter and about two degrees short of its end, a margin of well under ten minutes either way.

Lagna, Moon sign and Western rising sign are three different answers

The Moon sign, or rashi, is the sign the Moon occupied, and it changes on a scale of days; the lagna is the sign on the horizon, and it changes on a scale of hours. In the example they fall in different signs — Scorpio rising, the Moon in Aquarius, the fourth sign counted from the lagna — and neither can be worked out from the other.

A Western rising sign is a third answer. It is the same horizon degree measured in the tropical zodiac, which now runs about 24° ahead of the sidereal one, so a Western ascendant is usually the sign after the Vedic lagna; the two agree only when the sidereal lagna falls in roughly the first six degrees of its sign. The example's Scorpio 11°23′ becomes a Western Sagittarius rising, close to 5° into the sign. The point on the horizon is identical. Only the ruler it is measured against differs.

What the lagna cannot settle on its own

The calculation is exact; the input rarely is. Hospital records and certificates are often rounded to the quarter- or half-hour, and family memory is coarser still. If the result's degree is within a couple of degrees of either end of the sign, treat the rising sign as provisional, and treat the pada and the navamsa lagna as unknown — the navamsa lagna changes every 3°20′ of rising degree, roughly every quarter of an hour.

Rectification, adjusting an uncertain time until the chart agrees with known events, is outside what this page does, and there is deliberately no unknown-time option: the Sun, and even the Moon, can be bracketed across a day, but a lagna bracketed across a day is every sign of the zodiac. The ayanamsa setting matters far less than the clock: the choices in the form move the lagna by anything from a few arcminutes to about four degrees, at most a quarter of an hour or so of clock time. And the lagna is the frame of a reading, not the reading — it says where the houses begin, not what fills them.

What is my lagna if I only know roughly when I was born?

Enter your best estimate and look at the degree in the result. If it sits well inside the sign, between about 5° and 25°, an error of twenty minutes or so will not change the rising sign, though the pada may move. If the degree is near 0° or 30°, try the times either side of your estimate; when they disagree, the rising sign stays uncertain until the time can be pinned down.

Is the lagna the same as the ascendant or rising sign?

Yes. Lagna is the Sanskrit term for the ascendant, the point of the zodiac on the eastern horizon at birth, and the sign containing it is the rising sign. The only catch is the zodiac used: a Vedic lagna is sidereal while a Western rising sign is tropical, so for the same moment and place the two usually name neighbouring signs.

What is a lagna kundli?

It is the birth chart drawn with the rising sign as the first house — the standard janam kundli. Each of the twelve boxes is a sign, the lagna's box is the first house, and every planet is entered in the sign it occupies. A chandra kundli redraws the same planets with the Moon's sign as the first house, which is a useful second view when the birth time is doubtful.

Why do two websites give me different ascendants?

The usual causes are a different zodiac, a different ayanamsa, a wrong time zone, or birthplace coordinates that are off. A Western site will normally show the next sign along, because it works in the tropical zodiac. Between two Vedic tools, a gap of a degree or so points to the ayanamsa, while a whole sign of difference usually points to the birth time or its time zone.

Can twins have different lagnas?

They can, though usually they do not. Twins are often born ten to thirty minutes apart, which moves the rising degree by roughly two to eight degrees — enough to change the pada and the navamsa lagna, and occasionally the rising sign itself when the first birth came near the end of a sign. Their Moon signs, by contrast, are almost always the same.

Why does the calculator show where the lagna lord sits?

Because the classical method reads the first house partly through its owner. The lagna lord is the planet ruling the rising sign, and the house it occupies ties the self to that house's affairs in the traditional scheme. The page reports the placement as a fact; weighing it against the lord's strength, aspects and dasha periods belongs to a reading of the whole chart.