Vedic vs Western astrology: why your sign is different
Most people find their Vedic Sun sign is one sign earlier than their Western one. The reason is a gap of about 24 degrees between two ways of measuring the zodiac.
Updated
Many people draw their first Vedic chart and find a surprise. Their Sun is not in the sign they have always known. A Western Leo is told they are a Vedic Cancer. Nothing is wrong with the chart. The two systems measure the zodiac from different starting points.
Two zodiacs
Both systems divide the sky into the same twelve signs of 30 degrees each. They differ on where Aries begins.
- Western astrology uses the tropical zodiac. Aries begins where the Sun is at the March equinox. The zodiac is tied to the seasons.
- Vedic astrology uses the sidereal zodiac. Aries begins at a fixed place among the stars. The zodiac is tied to the constellations.
About 1,700 years ago the two starting points were the same. They have been drifting apart ever since.
Why they drift: the ayanamsa
The Earth's axis wobbles slowly, like a spinning top. One full wobble takes about 26,000 years. Because of it the equinox point slides backwards against the stars by one degree roughly every 72 years.
The gap between the two zodiacs is called the ayanamsa. Today it is about 24 degrees. Most Indian astrologers and the Indian national calendar use a value called the Lahiri ayanamsa.
What this does to your signs
To go from a Western position to a Vedic one, subtract about 24 degrees.
A sign is 30 degrees wide. So for roughly four people in five, a planet moves back into the previous sign. Only a planet in the last six degrees of a Western sign stays in the same sign.
| Western Sun sign dates (about) | Vedic Sun sign for most of that period |
|---|---|
| Aries: 21 March to 19 April | Pisces |
| Taurus: 20 April to 20 May | Aries |
| Gemini: 21 May to 20 June | Taurus |
| Cancer: 21 June to 22 July | Gemini |
| Leo: 23 July to 22 August | Cancer |
| Virgo: 23 August to 22 September | Leo |
| Libra: 23 September to 22 October | Virgo |
| Scorpio: 23 October to 21 November | Libra |
| Sagittarius: 22 November to 21 December | Scorpio |
| Capricorn: 22 December to 19 January | Sagittarius |
| Aquarius: 20 January to 18 February | Capricorn |
| Pisces: 19 February to 20 March | Aquarius |
In the sidereal zodiac the Sun enters each sign around the middle of the month, close to the 14th to the 17th.
The same shift applies to the Moon, the rising sign and every planet.
Other differences
The zodiac is the biggest difference but not the only one.
| Vedic | Western | |
|---|---|---|
| Main sign | Moon sign and rising sign | Sun sign |
| Timing of life | Dasha periods led by planets | Mostly transits and progressions |
| Planets | Nine, with Rahu and Ketu | Ten, with Uranus, Neptune and Pluto |
| Houses | Usually whole sign | Often Placidus and other systems |
| Finer division | 27 Nakshatras (stars) | Not used |
| Chart shape | Square or diamond | Circle |
Two points stand out.
The Moon matters more than the Sun. When someone in India asks for your sign they usually mean your Moon sign, your Rashi. The Moon sign and its star also decide where your Dasha cycle begins.
Timing is built in. The Dasha system gives a calendar of periods for the whole life, each led by one planet. Western astrology has no direct equivalent.
Which one is right?
They are two different systems with their own rules and each is consistent within itself. A Vedic chart should be read with Vedic rules and a Western chart with Western rules. Mixing them, such as reading a Western Sun sign with Vedic Dasha periods, gives confusion.
If you grew up with one Sun sign and your Vedic chart shows another, both statements are true. They are answers to two different questions.