Date, time and place of birth are enough; without the time you get the sidereal Sun and Moon but not the ascendant. The calculation runs in your browser, with the same astronomical engine as our ascendant calculator, subtracting the offset between the two zodiacs (the Lahiri ayanamsa, the one used by India’s official calendar) and locating the Moon in one of the 27 lunar mansions.
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Indian astrology — jyotish, “the science of light” — shares with Western astrology the twelve signs, the seven visible bodies and the idea of a chart drawn for the moment of birth. But it measures the sky differently. The Western zodiac is tropical: its zero point is the spring equinox, and Aries always begins on 20 or 21 March. The Indian zodiac is sidereal: its zero point is fixed against the stars, and it has drifted about 24 degrees from the first since the two coincided, around the 3rd century AD. The cause is the precession of the equinoxes, the slow wobble of the Earth’s axis that shifts the vernal point by one degree every 72 years.
The consequence is concrete: three people in four change sign when moving from one system to the other, almost always going back one sign. A Western Aries born in early April is Pisces (Meena) in India; a Leo born in early August is Cancer (Karka). Neither is “right”: they are two conventions, and Indian astrologers themselves use several values of the ayanamsa, differing by a degree or two. The most common, Lahiri’s, was adopted by India’s calendar reform committee in the 1950s.
When an Indian asks your sign, they want your rashi, the Moon’s sign, not the Sun’s. The Moon changes sign every two and a half days, which makes the rashi more personal than a Sun sign shared by a twelfth of humanity. Finer still, the sky is divided into 27 nakshatras, “lunar mansions” of 13°20’ each, themselves divided into four quarters (padas): the Moon crosses about one a day. The birth nakshatra gives the first syllable of the first name in traditional families, the temperament, the symbolic animal, and serves as the basis for matching couples before marriage.
Jyotish counts nine grahas, “those that seize”: the Sun (Surya), the Moon (Chandra), Mars (Mangala), Mercury (Budha), Jupiter (Guru), Venus (Shukra), Saturn (Shani), and two bodiless ones, Rahu and Ketu, the lunar nodes — the two points where the Moon’s orbit crosses the Sun’s, responsible for eclipses. Uranus, Neptune and Pluto, discovered after the treatises were written, are not part of it. Rahu and Ketu, always opposite each other in the chart, carry the most dramatic part of the interpretation: obsessions and desires for one, detachment and debts of the past for the other.
The twelve rashis bear Sanskrit names — Mesha, Vrishabha, Mithuna, Karka, Simha, Kanya, Tula, Vrishchika, Dhanu, Makara, Kumbha, Meena — and the same planetary rulers as in the West. The twelve bhavas, the houses, are most often counted in whole signs from the sign of the ascendant, the lagna: if your ascendant is in Simha, the whole sign of Leo is your first house, Virgo your second, and so on. It is simpler than Western house systems, and it is why the exact time of birth matters so much: it fixes the lagna and, with it, the whole grid.
The Indian chart is usually read in a square, the kundali, not a wheel. Two drawings coexist: the northern square, where the houses have a fixed place and the signs are written in, and the southern square, where the signs have the fixed place.
Each nakshatra has a deity, a symbol, an animal (the yoni) and a planetary ruler that returns every ninth place in a fixed order — Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury. Here is the list, with the keyword tradition keeps for each.
This is jyotish’s most striking originality, with no Western equivalent. Each life is cut into planetary periods, the dashas, during which one body “rules”: its promises in the chart come true, its difficulties too. The most widely used system, the Vimshottari, covers 120 years in nine periods of fixed length: Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17. The first period is that of the ruler of the Moon’s nakshatra at birth, already elapsed by a fraction proportional to the Moon’s position within that nakshatra; the following ones run in order. Each major period is subdivided into sub-periods by the same key. When an Indian astrologer announces “a Saturn period” or “a Jupiter that is beginning”, this is what they mean — and it is what makes their consultations so dated: they do not say “one day”, they say “from March in two years’ time”.
Jyotish is not a magazine column; it is a service that millions of families use at precise moments. At birth, the chart (janam kundali) and the first name, whose first syllable is often taken from the Moon’s nakshatra. Before a wedding, the matching of the two charts and the date of the ceremony, the muhurta, which also fixes dates for moving house, opening a business or signing. In hard times, remedies: stones (coral for Mars, pearl for the Moon, blue sapphire for Saturn, never worn without a trial), mantras, donations or fasts on the day of the offending planet. The big dailies publish forecasts by rashi, matrimonial websites calculate the 36 points, and Indian universities have offered jyotir vigyan courses since 2001, which raised a lively controversy among the country’s scientists.
The oldest part is calendrical: the Vedanga Jyotisha, in the first millennium BC, fixes the dates of Vedic rituals by the Moon and the nakshatras, which are already there. Horoscopic astrology — the individual chart with ascendant and houses — arrives later, through contact with the Greek world: the Yavanajataka, “the horoscopy of the Greeks”, translated and adapted around the 2nd or 3rd century, bears witness to it, and Sanskrit vocabulary keeps the trace (hora for the hour, kendra for the angle). The classical treatises follow: Varahamihira and his Brihat Jataka in the 6th century, then the Brihat Parashara Hora Shastra, attributed to the sage Parashara, which remains the practitioners’ reference. The choice of the sidereal zodiac and the invention of the dashas are Indian; the structure of the chart comes from the Mediterranean. The full history of astrology tells this back-and-forth.
The same as any astrology: no demonstrated predictive value, despite tests conducted in India itself — including a 2009 study in which experienced astrologers could not tell, from their charts, healthy children from children with intellectual disabilities. What is real is the system’s social weight in a country of a billion and a half people, and its internal coherence, stricter than that of Western astrology. Knowing it means understanding part of Indian culture and its diaspora; consulting it is a game, provided you do not let it decide a marriage or a treatment.
Because the two zodiacs are no longer aligned: the sidereal one lags 24° behind the tropical one. If you were born in the first 24 degrees of your Western sign — roughly the first 24 days — you go back one sign in India; otherwise you keep the same one.
For the rashi and the nakshatra it helps (the Moon changes nakshatra every day); for the ascendant, the houses and the dashas it is indispensable. Indian astrologers ask for the time to the minute, and a birth “around noon” is already a problem for them.
The two nodes of the lunar orbit, treated as shadow planets. They move backwards relative to the others and circle the zodiac in 18.6 years. In mythology they are the head and body of the beheaded demon who periodically swallows the Sun and the Moon: eclipses.
No. Chinese astrology is an independent system, based on the calendar and the sixty-year cycle, without a planetary chart in the Greek sense. Exchanges existed, through Buddhism, but the two traditions remain distinct; see the Chinese zodiac.
Page checked in September 2026. The data cited can change.
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