1. Sidereal Zodiac Compatibility
  2. Sidereal Astrology
  3. Sidereal Astrology Compatibility App
Zodiac symbolTwins
Duration (tropical, western)May 20 – June 21 (2021, UT1)[1]
Zodiac elementAir
Zodiac qualityMutable
Sign rulerMercury
ExaltationNorth Node
FallSouth Node

Gemini (♊︎) (/ˈɛmɪn/JEM-in-eye,[2] Latin for 'twins') is the third astrological sign in the zodiac, originating from the constellation of Gemini. Under the tropical zodiac, the sun transits this sign between about May 21 to June 21.[3] Under the sidereal zodiac, the sun transits this sign from about June 16 to July 16. Gemini is represented by the twins, Castor and Pollux,[4] known as the Dioscuri in Greek mythology. It is a positive, mutable sign. Gemini is associated with the Yang polarity (masculine) in the Yin Yang ancient Chinese concept. [5]

Sidereal astrology compatibility and its zodiac is based on the constellations as they are in contrast to tropical zodiac that uses the constellation positions as they used to be. Here is a chart outlining the sidereal zodiac dates. Precessionaccounts for the 25 day shift of the signs. If you were a Leo born Aug 15, you are a now a cancer under the sidereal zodiac. If you are a Gemini born June 20, you are still a Gemini under the sidereal zodiac.


In Babylonian astronomy, the stars Pollux and Castor were known as the Great Twins. Their names were Lugal-irra and Meslamta-ea, meaning 'The Mighty King' and 'The One who has arisen from the Underworld'. Both names are titles of Nergal, a major Babylonian god of plague and pestilence, who was king of the underworld.[6]


In Greek mythology, Gemini is associated with the myth of Castor and Pollux. Pollux was the son of Zeus, who seduced Leda, while Castor was the son of Tyndareus, the king of Sparta and Leda's husband. When Castor died, because he was a mortal, Pollux begged his father Zeus to give Castor immortality, which was done through uniting them together in the heavens.

Moon in Fourth House as per Vedic Astrology Know result of planet Moon in 4th House Moon in 4th House according to Saravali: If the Moon be in 4th, the native will be endowed with relatives, paraphernalia and conveyances, be charitable, fond of travelling by water and will neither be very happy nor be miserable. Moon in fourth house vedic astrology calendar. The Fourth House in astrology reflects the compassionate and unconditionally loving nature of Cancer and Moon. The energies of 4th house and Cancer are directed towards maintaining peace, sense of security, and unconditional love in the world. The 4th house relates to (by significances) Moon, Mars, Jupiter, Mercury, and Venus. Results of Moon in fourth house. The fourth house stands for mother, domestic life, family, possessions, property, vehicle and mental peace. Moon in 4th house indicates that the native would be strongly attached to his mother. His or her ties with the native place would be quite strong. Family is important to these people, and so are traditions and heritage.

In popular culture[edit]

Sage the Gemini, born Dominic Wynn Woods, took his stage name from his zodiac sign Gemini and the color of his eyes.[7]

NASA named its two-person space capsule Project Gemini after the zodiac sign because the spacecraft could carry two astronauts.[8]


  • From the medieval Georgian manuscript of a 12th-century astrological treatise

  • Ornamentation from an altar cloth from 13th-century Germany. The two figures are depicted with the heads of dogs.

  • Gemini (al-Gawzaa) depicted in the 14th/15th-century Arabic astrology text Book of Wonders

  • Gemini by Willem Blaeu, 1602


  1. ^Astronomical Applications Department 2011.
  2. ^Unicode Consortium 2015.
  3. ^Britannica n.d.
  4. ^Oxford 2018, entries for Gemini and Cancer.
  5. ^'What is your YIN-YANG compatibility? Astrology and Tarot'. October 25, 2016. Retrieved February 14, 2021.
  6. ^White 2008, p. 125.
  7. ^Ju 2018.
  8. ^Humans n.d.

Works cited[edit]

Sidereal Zodiac Compatibility

  • Astronomical Applications Department (2011). Multiyear Computer Interactive Almanac. 2.2.2. Washington DC: US Naval Observatory. Longitude of Sun, apparent geocentric ecliptic of date, interpolated to find time of crossing 0°, 30°..
  • Atsma, Aaron J. (c. 2015). 'DIOSCURI : Greek Gods of Horsemanship, Protectors of Sailors Mythology, Dioskouroi, w/ pictures'. Theoi. Retrieved September 23, 2016.
  • Baker, Douglas M. (April 26, 2016). Gemini - The Key to Your Inner Self. Claregate Ltd. ISBN9781910228142.
  • 'English Oxford Living Dictionary'. Oxford University Press. 2018.
  • 'Gemini'. Encyclopedia Britannica. n.d. Retrieved June 24, 2020.
  • 'Humans in Space'. airandspace.si.edu. n.d. Retrieved February 2, 2021.
  • Ju, Shirley (March 27, 2018). 'SAGE THE GEMINI RECALLS MEETING HBK GANG & HIS EARLY INFLUENCES'. HipHopDX. Retrieved February 2, 2021.
  • Tierney, Bil (2001). All Around the Zodiac: Exploring Astrology's Twelve Signs. St. Paul, Minnesota: Llewellyn Worldwide. p. 81. ISBN0738701114.
  • Unicode Consortium (2015). 'Unicode 8.0 Character Code Charts'(PDF). Retrieved April 21, 2016.
  • White, Gavin (2008). Babylonian Star-lore. Solaria Pubs.

External links[edit]

Look up Gemini#English or Gemini in Wiktionary, the free dictionary.
Wikimedia Commons has media related to Gemini (astrology).
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Gemini_(astrology)&oldid=1017296964'
(Redirected from Sidereal astrology)

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]

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 degrees behind tropical sun signs.[5] Per these calculations, persons born between March 12 - April 12, 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.
Sidereal astrology compatibility

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.

SymbolConstellationTropical date[7]Sidereal Date
Cyril Fagan[citation needed]
Based on IAU boundaries
Walter Berg[9]
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 17
SagittariusNovember 23 – December 21December 17 – January 15December 17 – January 20
CapricornDecember 22 – January 20January 16 – February 14January 20 – 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]


Why sidereal astrology is wrong
  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'. Los Angeles Times. Times. January 14, 2011. Archived from the original on January 19, 2011.
  • '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]

Sidereal Astrology

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

Sidereal Astrology Compatibility App

Retrieved from 'https://en.wikipedia.org/w/index.php?title=Sidereal_and_tropical_astrology&oldid=1018541903'
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