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Natalie Miller is a excellent 13 sign astrologer and a gifted writer. Her insights and explanations into the true Zodiac are illuminating and entertaining. Visit her facebook page, Cosmic Humans.


Vasilis Kanatas is a pioneer in 13-sign astrology, and a prime developer of the Prometheus 13-sign software which he co-wrote. Making true astronomical charts have never been easier, and this software has an "animate" feature so you can track transits in real time. This amazing application is available on his website for as little as $215 for the basic version, and $345 for the deluxe version, which includes a beautiful interactive sky-map. A must for the 13-sign astrologer.

Click to go to Vasilis' website


ASTROAPP is a cloud-based 13-sign astrology system that's perfect for any astrologer or the curious star-gazer to learn about the Astronomical Zodiac. For $13 a month, you can make accurate 13-sign horoscopes, transit charts, generate both traditional and Parens aspects, and retain and export your charts. Astroapp is native 12-sign, but the authors are making an effort to accomodate 13-sign, and all the house systems--and they offer free updates and instant technical advice. This is a very good value, I use it to make charts on my phone, when I'm on the go.


Click to go to astroapp


The Mystic. 13-sign Zodiac from the cosmic perspective, with graphics and an analysis of the 26,000 year cycle of the precession of the equinoxes (the "holy cross"). A combination of astronomy, mythology, and current events. "Although the few years ahead may stimulate intense revolutionary action and reaction, they also provide opportunity for wide sweeping solutions that heralds us into a new time/paradigm on Earth." Mind-blowing. Free and also subscription, (English)

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Music by Ophiuchus

The Works of Zearle (Double Ophiuchus)




Comparison of the Zodiac systems





Aries Mar 21 - April 20 April 15 - May 15 April 19 - May 13
Taurus April 21 - May 20 May 16 - June 15 May 14 - June 19
Gemini May 21 - June 20 June 16 - July 15 June 20 - July 20
Cancer June 21 - July 21 July 16 - Aug 15 July 21 - Aug 9
Leo July 22 Aug 22 Aug 16 - Sep 15 Aug 10 – Sep 15
Virgo Aug 23 - Sep 22 Sep 16 - Oct 15 Sept 16 – Oct 30
Libra Sep 23 - Oct 22 Oct 16 - Nov 15 Oct 31– Nov 22
Scorpio Oct 23 - Nov 21 Nov 16 - Dec 15 Nov 23 – Nov 29
Ophiuchus NA NA Nov 30 – Dec 17
Sagittarius Nov 22 - Dec 21 Dec 16 - Jan 14 Dec 18– Jan 18
Capricorn Dec 22 - Jan 20 Jan 15 - Feb 14 Jan 19 – Feb 15
Aquarius Jan 21 - Feb 19 Feb 15 - Mar 14 Feb 16– Mar 11
Pisces Feb 20 - Mar 20 Mar 15 - April 14 Mar 12 – April 18

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[These books are for 12-sign astrology; However, aspect and transiting angles are the same in all systems.

Go to our Ophiuchus Rising page for the meanings of the angles, planets and asteroids in Ophiuchus]

Key Words for Astrology -- Paperback
by Hajo Banzhaf, Anna Haebler
BUY ON Amazon

Aspects in Astrology: A Guide to Understanding Planetary Relationships in the Horoscope -- Paperback
by Sue Tompkins
BUY ON Amazon

Sextrology: The Astrology of Sex and the Sexes -- Paperback By Stella Starsky, Quinn Cox
BUY ON Amazon

Transits Simplified -- Paperback
by Sakoian & Acker
BUY ON Amazon

Astrology of Human Relationships -- Paperback
by Frances Sakoian
BUY ON Amazon



13 sign astrology app for $13/month


13 Sign charts and real time transits

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