While synchronically, the two systems are identical, Jyotiṣa primarily uses the sidereal zodiac (in which stars are considered to be the fixed background against which the motion of the planets is measured), whereas most Western astrology uses the tropical zodiac (the motion of the planets is measured against the position of the Sun on the.

Sidereal Vedic Ephemeris 2021, Free Astrology Planetary Online Ephemeris Tables 1800-2100, Astrology JPL NASA Astro.com Online Ephemerides Calendar, Free Planetary Ephemeris Calculator 1800-2100, Ephemeris Online Download.PDF. Seek and meet people born on the same date as you. AstroSeek, Free Horoscopes and charts 2021 Astro-Seek.com. The following ephemerides are for the Sidereal Zodiac with the Lahiri ayanamsa, which is quite different (approximately 23 to 24 degrees difference). For example, on January 1, 2021, the Sun is at 16 Sagittarius 51 in the Sidereal ephemeris, while the Sun is at 11 Capricorn 00 in the Tropical ephemeris. Sidereal Transit Chart - $7. A PDF of your Sidereal Natal Chart, Progressions, and Transits. Shows the real location of the transiting planets relative to your Birth Chart. Great for forecasting current and future life events.

When you first entertained astrology, you probably assumed the 'signs' corresponded with actual constellations. That's natural right? When someone says they are a Leo, they assume the Sun was in the constellation of Leo at the time of their birth. They might be surprised to learn that it more likely was in the constellation of Cancer.

What is sidereal in astrology

What?! Yes, it is a bit odd. From a broad perspective, the issue is that calculating actual star positions in the sky is not very easy. In the Neo-Babylonian period, around 700 B.C., when the first roots of modern astrology were sprouting - people did actually look to the sky to chart constellations and their positions. Likely, early people were very connected to the movements of the stars.

At 700 B.C., people did not even know the effect of the precession. What is that? Here's an image that demonstrates it perfectly: The earth's rotational axis itself is slowly changing.

By slow, we mean very slow. The full rotation of the axis of the earth itself takes 26,000 years. But astrology has been present for a very long time. It’s already been more than 2,000 years since the Babylonians defined some of the first constellations we still use today!

This means that the rotational axis of the earth has shifted today since astrology was first in use, and continued to be in use over the many centuries. The stars today are in a different position in the sky. They are not off by much though. It approximately 25 degrees back (so if your Sun is 22° Scorpio, the true position of your Sun was 27° Libra). Eventually, it will be a full sign back. The true position of the planets are effectively the Sidereal calculations.

Ok so star positions are slowly shifting - but why do we continue to antiquated positions?

So we know what Sidereal Chart calculations are now. They are the positions of your Sun, other planets, and asteroids in their true constellation regions in the sky. There is another school of thinking which defines modern astrology and bases the energy of the signs on 'the time of year' rather than the positions of the stars. It's called Tropical rather than Sidereal.

In Tropical astrology, if you are born on the Vernal Equinox, you are a 0° Aries Sun. It's irrelevant what the constellation in the sky is. The 'energy' of the that time of the year is Aries. What is the Vernal Equinox? It can occur as early as March 19th or as late as March 21st, and is the period of the year when the path of the Sun passes over the Earth's equator. Here is a visual representation.

What is true sidereal astrology

Note that the Sun's path is brown in the image above, as it travels along the celestial plane or 'ecliptic'. Our Earth's equator is the equatorial plane. Note that around March 21st or at the Vernal equinox every year, the Sun's path cross the ecliptic and starts heading northward. It enters the Northern Hemisphere and peaks there at June 21st (the Summer Solstice) which is why summer occurs around June in the North. Visa versa in the Southern Hemisphere.

So, the Tropical system of astrology which is our default on this site and throughout most of Western Astrology, uses the Vernal Equinox and time of year to determine what is called the First Point of Aries. Back in Babylonian times, this used to really correspond with Aries. It no longer does. Due to the precession of the equinoxes, it is now in Pisces. By the year 2600 it will be in Aquarius.

In the Tropical system, all of the other signs are simply measured 30 degrees from the First Point of Aries, and thus the Tropical horoscope is formed.

How can I calculate Sidereal position on this site?

Maybe you would not like to use the Tropical chart calculations. I prefer tapping intuitively the energy of the signs and concluding what is right for you. I find resonance with the Tropical system and many do. But if you'd like to use Sidereal charts on our site now, its easy!

Why Sidereal Astrology Is Wrong

You don't need any special Sidereal chart calculator to see them. Simply create a birth chart and enter your date of birth and location.

Open Chart Settings (to the right of the chart) and scroll down to check the 'Use Sidereal Calculations' checkbox. Now your chart, planets, houses, aspects and patterns will transform to use new Sidereal positions.

What Is Sidereal Astrology Sign

Why should I opt to use Tropical Astrology over Sidereal?

Perhaps hearing that modern astrology is out of sync with real constellation positions may spur your interest in Sidereal calculations. It's interesting to note though that astrologers as early as the first century A.D. were opting for the Tropical system. Ptolemy noted this in his books. Many astrologers were also aware the constellations used did not perfectly cover their segements of the ecliptic, which were divided into 12 equal sized pieces.

Meanwhile some constellations are much smaller or larger than others. Some also note the constellation Ophiuchus covers a portion of the ecliptic. But it was assumed that the constellations were more just the conventional names for the energies reflected by these 12 sections.

What is sidereal astrology venusWhat Is Sidereal Astrology

There is magic to the mathematical nature of the number 12, its easy division into 4 elements (air, earth, fire and water) and 3 modes (cardinal, mutable, fixed). It's likely the evenness and ease of the system was favorable to the fixed star positions, which after all were difficult to calculate for Middle age astrologers.

However, it should be noted that in this modern day its easy for us to calculate this positions which opens up a whole new world of exploration and potential that we should take advantage of! :)

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.[1]

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.[2][3][4] 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.[3][5] This has caused the two systems, which were identical around 2,000 years ago, to drift apart over the centuries.[2][3][5]

Libra Weekly Sunday 18th April 2021. Yours is not a sign given to over-thinking issues of life and death. Yet you are a good strategist. It may be important presently to consider your legacy and, at a slightly different level, basic insurance. Financial matters of all kinds could have your attention too. Horoscope libra weekly 800. Libra is the seventh astrological sign on the Zodiac and it runs from September 23rd to October 22nd. It is represented by the sign of the Scales and is an air sign.

Ayanamsa systems used in Hindu astrology (also known as Vedic astrology) include the Lahiri ayanamsa and the Raman ayanamsa.[6] The Fagan-Bradley ayanamsa is an example of an ayanamsa system used in Western sidereal astrology.[6] As of 2020, sun signs calculated using the Sri Yukteswar ayanamsa were around 23 or degrees behind tropical sun signs.[5] Per these calculations, persons born between 12 March - 12 April, for instance, would have the sun sign of Pisces.[5] By contrast, persons born between March 21 - April 19 would have the sun sign of Aries per tropical calculations.[7]

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[8] corresponding to a difference of some 39 degrees or days.

Precession of equinoxes, the changing position of the vernal equinox over the course of about 25,800 years. The yellow line is a section of the ecliptic, the apparent path the Sun appears to follow over the course of an Earth year. The purple line is the celestial equator, the projection of Earth's equator onto the celestial sphere. The point (red) where these two lines cross is the vernal equinox. In 1500 BCE, it was near the end of Aries; in 500 BCE, it was near the beginning of Aries; and in 1000 to 2500 CE Pisces.

What Is Sidereal Astrology Uranus

Astronomic zodiac[edit]

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.[citation needed]

Stephen Schmidt in 1970 introduced Astrology 14, a system with additional signs based on the constellations of Ophiuchus and Cetus.[citation needed]

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.[citation needed]

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.[citation needed]

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.

What Is Sidereal Astrology Compatibility

ConstellationTropical date[7]Sidereal Date
Cyril Fagan[citation needed]
Based on IAU boundaries
Walter Berg[9][verification needed]
AriesMarch 21 – April 20April 15 – May 15April 18 – May 13
TaurusApril 21 – May 21May 16 – June 15May 13 – June 21
GeminiMay 22 – June 21June 16 – July 16June 21 – July 20
CancerJune 22 – July 22July 17 – August 16July 20 – August 10
LeoJuly 23 – August 22August 17 – September 16August 10 – September 16
VirgoAugust 23 – September 23September 17 – October 17September 16 – October 30
LibraSeptember 24 – October 23October 18 – November 16October 30 – November 23
ScorpioOctober 24 – November 22November 17 – December 16November 23 – November 29
OphiuchusN/ANovember 29 – December 18
SagittariusNovember 23 – December 21December 17 – January 15December 18 – January 21
CapricornDecember 22 – January 20January 16 – February 14January 21 – February 16
AquariusJanuary 21 – February 19February 15 – March 15February 16 – March 11
PiscesFebruary 20 – March 20March 16 – April 14March 11 – April 18

See also[edit]


  1. ^'The Tropical, Sidereal & Constellational Zodiacs: the Power of World View'. www.renaissanceastrology.com. Retrieved 2020-07-29.
  2. ^ abSubramanian, Vijaya. 'Sidereal and Tropical Zodiac – Vijaya Jyoti'. Retrieved 2020-07-29.
  3. ^ abcgalacticcenter (2016-10-10). 'What is Vedic Astrology?'. Galactic Center with Joni Patry. Retrieved 2020-07-29.
  4. ^Taya. 'Understanding Sidereal Charts'. astro-charts.com. Retrieved 2020-07-29.
  5. ^ abcdVallée, Guylaine (2020-03-01). 'What's Your Vedic Astrological Sign?'. Birla Vedic Center. Retrieved 2020-07-29.
  6. ^ ab'Ayanamshas in Sidereal Astrology'. www.astro.com. Retrieved 2020-07-29.
  7. ^ ab'Zodiac Sign Dates: What Are The Dates for Every Star Sign?'. Astrostyle: Astrology and Daily, Weekly, Monthly Horoscopes by The AstroTwins. Retrieved 2020-07-29.
  8. ^http://www.solsticepoint.com
  9. ^New astrological sign: Professor finds horoscopes may be a little off kilter aJanuary 14, 2011 article from the Los Angeles Times
  • 'The Real Constellations of the Zodiac.' Dr. Lee T. Shapiro, Planetarian, Vol 6, #1, Spring (1977). [1]
  • 'The Real, Real Constellations of the Zodiac.' John Mosley, Planetarian, Vol. 28, # 4, December (1999).[2]
  • 'The Primer of Sidereal Astrology,' Cyril Fagin and Brigadier R. C. Firebrace, American Federation of Astrologers, Inc., (1971) ISBN0-86690-427-1
  • A History of Western Astrology, by S. Jim Tester, 1987, republished by Boydell Press (January 1999),ISBN0-85115-255-4, ISBN978-0-85115-255-4
  • Raymond, Andrew (1995). Secrets of the Sphinx Mysteries of the Ages Revealed. Hawaii: U N I Productions. ISBN0-9646954-6-4.

External links[edit]

  • Vedic astrology -- critically examined by Dieter Koch, with an extended discussion of sidereal and tropical astrology.
  • Sidereal Right Ascensions by Juan Antonio Revilla
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