Sidereal and tropical are terms used to describe two different definitions of a year. In astrology, they refer to two different systems of ecliptic coordinates used to divide the ecliptic into twelve 'signs'. Each sign is divided into 30 degrees, making a total of 360 degrees.
Explore the Astrology Charts of Famous people and celebrities. Explore the astrological natal birth charts of nearly 20,000 celebrities and famous people. Search for specific planetary placements, aspects or chart patterns to deepen your understanding of astrology. Search for person by name below. On Astrotheme, we take them into account, but with moderation, in our astrological reports and our on-line applications. Rulership A planet posited in the sign it rules is said to be in its rulership, domicile, or home. The 12 Houses of astrology are symbolic of the all the departments that make up human life. The planets and zodiac signs will manifest themselves most strongly in the sphere of life represented by the House in which they fall on your chart (and also in the House which they rule; more on House Rulerships below ).
While sidereal systems of astrology define the signs relative to the apparent backwards movement of fixed stars of about 1 degree every 72 years from the perspective of the Earth, tropical systems fix the vernal point or vernal equinox (also known as the March equinox in the Northern hemisphere) to 0 degrees of Aries and define the rest of the zodiac from this point. Sidereal astrology uses corrective systems known as ayanamsas (Sanskrit: 'ayana' 'movement' + 'aṃśa' 'component') to account for the precession of equinoxes, whereas tropical astrology does not use such measures. This has caused the two systems, which were identical around 2,000 years ago, to drift apart over the centuries.
Delayed marriage in vedic astrology. Ayanamsa systems used in Hindu astrology (also known as Vedic astrology) include the Lahiri ayanamsa and the Raman ayanamsa. The Fagan-Bradley ayanamsa is an example of an ayanamsa system used in Western sidereal astrology. As of 2020, sun signs calculated using the Sri Yukteswar ayanamsa were around 23 degrees behind tropical sun signs. Per these calculations, persons born between March 12 - April 12, for instance, would have the sun sign of Pisces. By contrast, persons born between March 21 - April 19 would have the sun sign of Aries per tropical calculations.
Cyril Fagan, a Western sidereal astrologer, assumed the origin of the zodiac to be based on a major conjunction that occurred in 786 BC when the vernal equinox lay somewhere in mid-Aries corresponding to a difference of some 39 degrees or days.
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A small number of sidereal astrologers do not take the astrological signs as an equal division of the ecliptic but define their signs based on the actual width of the individual constellations. They also include constellations that are disregarded by the traditional zodiac but are still in contact with the ecliptic.
Stephen Schmidt in 1970 introduced Astrology 14, a system with additional signs based on the constellations of Ophiuchus and Cetus.
In 1995, Walter Berg introduced his 13-sign zodiac, which has the additional sign of Ophiuchus. Berg's system was well received in Japan after his book was translated by radio host Mizui Kumi (水井久美) in 1996.
For the purpose of determining the constellations in contact with the ecliptic, the constellation boundaries as defined by the International Astronomical Union in 1930 are used. For example, the Sun enters the IAU boundary of Aries on April 19 at the lower right corner, a position that is still rather closer to the 'body' of Pisces than of Aries. The IAU defined the constellation boundaries without consideration of astrological purposes.
The dates the Sun passes through the 13 astronomical constellations of the ecliptic are listed below, accurate to the year 2011. The dates will progress by an increment of one day every 70.5 years. The corresponding tropical and sidereal dates are given as well.
|Symbol||Constellation||Tropical date||Sidereal Date|
Cyril Fagan
|Based on IAU boundaries|
|Aries||March 21 – April 20||April 15 – May 15||April 18 – May 13|
|Taurus||April 21 – May 21||May 16 – June 15||May 13 – June 21|
|Gemini||May 22 – June 21||June 16 – July 16||June 21 – July 20|
|Cancer||June 22 – July 22||July 17 – August 16||July 20 – August 10|
|Leo||July 23 – August 22||August 17 – September 16||August 10 – September 16|
|Virgo||August 23 – September 23||September 17 – October 17||September 16 – October 30|
|Libra||September 24 – October 23||October 18 – November 16||October 30 – November 23|
|Scorpio||October 24 – November 22||November 17 – December 16||November 23 – November 29|
|Ophiuchus||N/A||November 29 – December 17|
|Sagittarius||November 23 – December 21||December 17 – January 15||December 17 – January 20|
|Capricorn||December 22 – January 20||January 16 – February 14||January 20 – February 16|
|Aquarius||January 21 – February 19||February 15 – March 15||February 16 – March 11|
|Pisces||February 20 – March 20||March 16 – April 14||March 11 – April 18|
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- Vedic astrology -- critically examined by Dieter Koch, with an extended discussion of sidereal and tropical astrology.
- Sidereal Right Ascensions by Juan Antonio Revilla