Vedic and Western astrology use the same twelve sign names but measure them from different starting points. Western astrology starts Aries at the spring equinox (the tropical zodiac); Vedic astrology starts it against the fixed stars (the sidereal zodiac). The two are now about 24° apart, so for most people the Vedic Sun sign is one sign earlier than the Western one.
This post explains where the gap comes from, gives today's value of the Lahiri ayanamsa from our engine, lists the Vedic Sun sign dates for 2026, and explains the part that surprises most newcomers: in India your "rashi" is not your Sun sign at all, but your Moon sign.
Two zodiacs with the same names
Both systems divide the Sun's yearly path (the ecliptic) into twelve equal signs of 30°. The only question is where 0° Aries goes.
- Tropical (sayana) zodiac, used in Western astrology. 0° Aries is the point where the Sun crosses the celestial equator in March, the spring (vernal) equinox. The signs are tied to the seasons: the Sun always enters tropical Aries around 20–21 March and tropical Cancer at the June solstice.
- Sidereal (nirayana) zodiac, used in Vedic astrology. 0° Aries is fixed relative to the stars. In the Lahiri (Chitrapaksha) system, it is defined so that the bright star Chitra (Spica) sits at 0° Libra, exactly opposite.
A long time ago the two starting points coincided. They have been drifting apart ever since because of the precession of the equinoxes: the Earth's axis wobbles slowly, like a spinning top, completing one circle in about 25,800 years. The equinox point slides backwards against the stars by about 50 seconds of arc a year, or one degree every 72 years or so.
Ayanamsa: the gap, measured
The angle between the two zero points is called the ayanamsa. To turn a sidereal position into a tropical one, you add the ayanamsa; to go the other way, you subtract it.
Our engine computes it for any moment. On 22 September 2026 the Lahiri ayanamsa is 24°13′59″ (24.2329°). For comparison, on 1 January 1990 it was 23°43′14″, so in 36 years and 9 months it grew by about half a degree, just as the 72-years-per-degree rule predicts.
Lahiri is not the only ayanamsa. Our engine also supports two others, and on the same day gives:
| Ayanamsa | Value on 22 Sep 2026 | Used by |
|---|---|---|
| Lahiri (Chitrapaksha) | 24.2329° | Indian government panchang, most Indian almanacs and software |
| KP | 24.1364° | Krishnamurti Paddhati practitioners |
| Raman | 22.7869° | followers of B. V. Raman |
In 1955 the Government of India's Calendar Reform Committee adopted the Chitrapaksha ayanamsa for the national almanac, and Lahiri has been the Indian default since. It is also our default. The one-and-a-half-degree gap between Lahiri and Raman is small, but it is enough to move dates: our sade sati guide shows Saturn entering Pisces eleven days apart under the two.
Why most people move back one sign
A sign is 30° wide and the gap is about 24°. So the Sun reaches any given sidereal sign about 24 days after it reaches the tropical sign of the same name (the Sun moves roughly one degree a day).
That means:
- If you were born in the first 24 days or so of your Western sign, your Vedic Sun sign is the previous sign.
- If you were born in the last 5 to 7 days of your Western sign, your Vedic Sun sign is the same.
Put simply, about four people in five find their Vedic Sun sign is one sign earlier. Nobody moves forward, and nobody moves two signs.
A worked example
Take a birth on 1 January 1990 at 10:00 am in Varanasi. Our engine puts the Sun at 16°46′ sidereal Sagittarius. Add that day's ayanamsa of 23°43′ and you get 10°30′ tropical Capricorn. So this person is a Capricorn in a Western horoscope and a Sagittarius (Dhanu) Sun in Vedic astrology. And, as we will see, their Indian rashi is neither: the Moon was in Aquarius (Kumbh).
Vedic Sun sign dates for 2026
These are the moments the Sun entered each sidereal sign in 2026, from our engine's transits data (Lahiri, Indian Standard Time). Each of these moments is a sankranti: Makar Sankranti on 14 January is the Sun entering sidereal Capricorn, and the solar new year festivals of mid-April follow Mesha Sankranti, the Sun entering sidereal Aries. The Western dates are the usual published ranges and can shift by a day in a given year.
| Sign | Vedic (sidereal) 2026 | Sun enters (IST) | Western (tropical), usual dates |
|---|---|---|---|
| Aries (Mesh) | 14 Apr – 14 May | 14 Apr, 09:32 | 21 Mar – 19 Apr |
| Taurus (Vrishabh) | 15 May – 14 Jun | 15 May, 06:22 | 20 Apr – 20 May |
| Gemini (Mithun) | 15 Jun – 15 Jul | 15 Jun, 12:53 | 21 May – 20 Jun |
| Cancer (Kark) | 16 Jul – 16 Aug | 16 Jul, 23:39 | 21 Jun – 22 Jul |
| Leo (Simha) | 17 Aug – 16 Sep | 17 Aug, 07:58 | 23 Jul – 22 Aug |
| Virgo (Kanya) | 17 Sep – 16 Oct | 17 Sep, 07:52 | 23 Aug – 22 Sep |
| Libra (Tula) | 17 Oct – 15 Nov | 17 Oct, 19:51 | 23 Sep – 22 Oct |
| Scorpio (Vrishchik) | 16 Nov – 15 Dec | 16 Nov, 19:43 | 23 Oct – 21 Nov |
| Sagittarius (Dhanu) | 16 Dec 2026 – 14 Jan 2027 | 16 Dec, 10:25 | 22 Nov – 21 Dec |
| Capricorn (Makar) | 14 Jan – 12 Feb | 14 Jan, 15:07 | 22 Dec – 19 Jan |
| Aquarius (Kumbh) | 13 Feb – 14 Mar | 13 Feb, 04:08 | 20 Jan – 18 Feb |
| Pisces (Meen) | 15 Mar – 13 Apr | 15 Mar, 01:03 | 19 Feb – 20 Mar |
Two cautions:
- The change day is split. On 17 October 2026 the Sun was in Virgo until 19:51 IST and in Libra after. If you were born on a change day, only the time settles it, which a kundli does for you.
- Dates move by a day between years. In 2027 our engine has the Sun entering Cancer on 17 July, Libra on 18 October and Scorpio on 17 November, a day later than in 2026. Over centuries the whole table drifts too: the sidereal dates slip about one day later every 72 years.
Moon sign vs Sun sign: what "rashi" means in India
This is the bigger difference, and it matters more than the 24°.
In Western popular astrology, "your sign" is the Sun sign, because the Sun's position is easy to know from the birth date alone. In Indian practice, "rashi" means the sign the Moon occupied at birth (chandra rashi). When someone in India asks "aapki rashi kya hai?", they mean the Moon sign.
The Moon is used because Indian tradition treats it as the mind (manas) and because it moves fast, about one sign every two and a half days, so it distinguishes people born close together far better than the Sun, which stays a month in each sign. Almost everything people meet in daily Indian astrology is built on it:
- Rashifal (daily and yearly horoscopes) is read from the Moon sign. Our rashifal pages, such as Aquarius, are written this way.
- Naming syllables come from the Moon's nakshatra and pada.
- Sade sati is Saturn's transit over the Moon sign.
- Kundli matching (gun milan) compares the two Moons' nakshatras and signs.
- Vimshottari dasha, the main timing system, starts from the Moon's nakshatra.
The Sun sign is not ignored. It fixes the solar months and the sankrantis, and in the chart it is read as one of nine planets, with its own house and strength. The lagna (the rising sign at birth) is usually considered the most personal point of all, since it changes about every two hours. A Vedic chart therefore gives you three "signs": lagna, Moon sign and Sun sign, and the Moon sign is the one people use in conversation.
Because the Moon also shifts by the same 24°, your Vedic Moon sign is often different from a Western Moon sign too. If you only ever check one thing, check your Moon sign from a sidereal chart.
What this means for you in practice
If you have been reading Western horoscopes all your life, none of this means you were "wrong". It means you were using a different ruler. A few practical points:
- For Indian horoscopes, use your Moon sign. Find it once from a sidereal kundli and use it for rashifal, sade sati and dhaiya.
- Do not mix systems in one reading. A Western Sun sign with an Indian rashifal, or a Vedic chart read with Western house rules, gives muddled results. Pick one framework per question.
- Check the ayanamsa when comparing charts. If two Vedic apps disagree on a planet's sign, the first thing to check is whether both use Lahiri.
- Birth time matters more than the zodiac debate. The Moon sign can change within a day and the lagna every two hours. An accurate birth time does more for a reading than any choice of zodiac.
Our guide on how to read your kundli takes you through the rest of the chart once you have these three signs.
Which one is "right"?
Honestly, the two zodiacs answer different questions. The tropical zodiac tracks the seasons, and the sidereal zodiac tracks the stars. Each is consistent with itself, and each tradition has built its interpretations over centuries within its own frame. Indian tradition, from the Surya Siddhanta onwards, has reckoned the signs sidereally and recognised the slow motion of the equinoxes (ayana chalana) as a separate correction. If you practise Jyotish, the sidereal zodiac is the one its rules were written for.
Two things are not the difference:
- The "13th sign" (Ophiuchus). Astronomical constellations have unequal sizes and the Sun crosses thirteen of them, including Ophiuchus. Neither zodiac uses constellations; both use twelve equal 30° signs.
- Accuracy of planetary positions. Modern Vedic and Western software compute the same planetary positions; the only difference is the ayanamsa subtracted at the end. Our engine's method and measured accuracy are described on our methodology page.
Neither choice turns astrology into a science or disproves it. We present these as the conventions they are and use the one the Indian tradition uses.
Try it yourself
Make a free kundli with your birth date, time and place. It shows your lagna, your Moon sign (rashi) and your sidereal Sun sign, and names the ayanamsa used. You can switch between Lahiri, Raman and KP on the same page to see how much, or how little, changes. Then read your rashifal by your Moon sign, and check the day's Moon sign and nakshatra any time in the panchang.