Predictions: Solar Arc and Secondary Progression

As per reader request I’ll talk about progression methods for a bit. Noel Tyl has written extensively about his method of prediction in Solar Arcs: Astrology’s most successful predictive system. The book is actually a summary of his predictive method incorporating transits, Solar Arcs, Secondary Progressed Moon, as well as Tertiary Progressed Moon.

Solar Arc over Secondary Progression?
Noel has also written a book about Secondary Progression early in his career, but now he prefers the Solar Arc method as the more reliable method. There are many fine astrologers using Secondary Progression as their tool of choice, so both methods are here to stay.

One of the key difference between the two methods is that in Solar Arc you get to advance the slower moving planets (Saturn onward) that hardly moves in the Secondary Progression method, so this tends to add more interpretive possibilities when forecasting.

Difference between transiting and Solar Arc planets
Solar Arc planets move at the speed of Secondary Progressed Sun, which is approximately one degree per year. This means even a fast planet like Venus will have a longer time frame (say 9 months) to be in orb using a Solar Arc method: this means Solar Arc of Venus to the Sun (written Venus=Sun) would last for 9 months, strongly suggesting the success of a relationship or an artistic endeavor.

In transit, Venus moves so fast that it can’t have much of an impact except for a couple days of pleasantness. Similar thing can be said of Jupiter, whose transit is fleeting but under the Solar Arc, suggests a 9 months period in which reward or opportunity is likely to be presented.

Solar Arc is relatively easy to test in your own horoscope: add 1 degree per year to the natal planets to see how they move and form an aspect with the natal planet. The orb needs to be exact (less than one degree) in order for the Arc to be in effect, and we count conjunction, square and opposition only.

If natal ASC is at 12 Leo, and natal Saturn is at 22 Leo, this means Solar Arc ASC will conjoin Saturn at age 10 (we write ASC=Sat to denote this period), then we ask if there had been a status change within the family around that age: some Saturnian event such as death in the family, sickness, move, or change in father’s position, etc.

A Major Principle – Looking for the Big Bells
“Nothing important happens in life unless the Angles, Sun, or the Moon is involved.” – Noel Tyl

We give special importance to the transits or Solar Arcs to these hot trigger points (as well as one other point called the Sun/Moon midpoint) by slower planets (Saturn through Pluto), since they tend to correspond with major life changes most often.

In the next post we will explore some interpretive principles for Solar Arc planets.

About Hiroki Niizato

Hiroki Niizato is a professional consulting astrologer in Florida, serving clients in US and abroad. He has been a practitioner of Eastern meditation path since 1997, and has been practicing astrology professionally since 2001. Hiroki is a highest honor graduate of the demanding Master’s Degree Certification Course in Astrology by Noel Tyl.

You can contact Hiroki via email at: or Phone: 727-470-4056 to ask a question or schedule a consultation.


  1. Hi Hiroki – Solar Arc Pluto is nearing a conjunction (within 1 degree) to my natal Sun (in the 2nd), Solar Arc Mars just squared (and is still within 1 degree) my natal Venus (also in the 2nd), and Solar Arc Ascendant is almost exactly conjunct my Natal Neptune(where else, but in the 2nd).

    Lately, our financial situation has been challenging, and this has caused me to seriously rethink my “value” to the world, which has been very confusing. If you have any insights as to how to interpret these Solar Arcs, I’d be very appreciative. Thanks very much.

  2. I just took another look, and Solar Arc Uranus just entered my 2nd house several months ago. This 2nd house theme seems to be a recurring one. And in my natal chart, I have a stellium there, which includes my North Node.

  3. Hiroki Niizato says:


    Major measurements like those you listed here suggest a time of profound shift in self perception – at least the opportunity for this is abundantly there, in the form of your current challenges.

    ASC=Neptune is tricky, and is bound to be accompanied by some confusion for a time. Be patient here.

    Best regards,

  4. Hiroki – I will try to follow your advice to be patient as I wade through the Neptunian Fog. In the meantime, I think I'll try to make the best of it by finding an appropriate outlet for my artistic talents. Thanks for sharing your wisdom — I do appreciate it.

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