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(February 10, 1923 - May 28, 2001)

-previously published by Seek-It Publications, West Bloomfield, Mi-
-reprinted on this website with permission from Marion March-updated september 2011
text suitable for astrologers only


This is an area many astrologers have dabbled with, but to the best of my knowledge very little has been written on it. Although I have worked with the astrological fertility cycle, conception charts and related fields for more than 20 years, I am learning something new with every horoscope. As the medical field pioneers new methods day after day, to the point where a woman after menopause can give birth, so we in the astrological world have to keep step. Thus regard this only as an overture, with the main concert still to be written.

First of all we need to divide that which we do know into three parts:

1) BIRTH CONTROL as based on the Fertility Cycle.

2) THE BEST TIME TO BECOME PREGNANT, based on the astrological fertility cycle, as well as on the woman's natural ovulation.



The ancients established that there seemed to be a connection between the ratio of the Sun to the Moon in a woman's chart and fertility. Just as the female body goes through the menstrual cycle, so the natal chart seems to indicate the times when a woman is most receptive to pregnancy, namely that moment, once a month, when the Moon is at the exact distance from the Sun as it is at birth.

For example: if your natal Sun is 15 Cancer 40 and your natal Moon 23 Scorpio 55, the distance between the two luminaries is 128 degrees and 15 minutes. Approximately every 29-1/2 days the Sun and Moon will be at a point where they are separated by 128 degrees and 15 minutes.

Dr. Eugen Jonas, a Czechoslovakian gynaecologist and astrologer worked with this fertility cycle in his clinic for many years and supposedly helped people to conceive. But modern couples were particularly intrigued by this method in order to prevent conception. They thought this might enable them to freely pursue sexual activities without resorting to such intrusive measures as birth control pills or intrauterine devices. BUT THIS THEORY DID NOT WORK which is why the entire Fertility Cycle fell into disrepute.


Some astrologers have assumed that if you know the day of your greatest fertility, by adding two or three days before and after, you have secured a fertile period and therefore the remaining days of the cycle should be infertile and safe. Please understand right up front that this method of birth control is totally unreliable and not recommended.

a) In today's world where the average woman has taken many artificial substances, from aspirin to birth control pills, there are very few whose natural cycle coincides with her astrological one and the expected 'safe' times may be when her natural ovulation takes place, a great time to get pregnant!

b) Even if you are fortunate enough to be in synchronicity with nature, nobody can predict exactly how long it takes the semen to travel up the birth canal to inseminate the egg or, at times 'lay in waiting' in the tubule area for the egg to be receptive.  Medicine says the average semen lives for 48 to 60 hours, but some doctors report that they know of cases where insemination took 72 hours, thus the safe day count can be way off. Of course the same thing happens if your client's ovulation occurs a day earlier than she had calculated, but then it's a physical, not astrological problem, and of no concern to you, the astrologer. But regardless, do not use this cycle to ensure birth control.


Yet the Fertility Cycle or time to get pregnant has proven to be very helpful. I have worked with this cycle for over 25 years now and have had some very positive results. Please understand, this has NOTHING to do with the BIRTH of the child, only with the PREGNANCY itself.

Although I have had many successes, I have also had failures and, more than anything else, I have learned great respect for nature and am sure that if something does not succeed, it is often because it is not supposed to succeed. Therefore I never promise results, I only offer to try and help to the best of my ability.

The nicest part of this astrological method is that the client does not have to undergo any medical procedure, there are no pills to be taken, no diets to follow and the only demand is to have intercourse at a certain time of the day, and that is usually not considered a hardship. But in these days of late-in-life-pregnancy and men with weak sperm, this simply cycle can only succeed if both parents are physically able to conceive and not in need of medical intervention. Therefore it becomes imperative to ask since when the couple have tried to conceive, if and when the doctor checked them regarding blockages, tubal problems, the husband's sperm count and many other possibilities. No 'good timing' can undo real physical blockages. The cycle is a simple method of finding the right time to help healthy people conceive a child. (Should there be medical problems, there are other means of helping clients which I will briefly talk about later).

Mechanics of Working with Fertility Cycles:

Pathfinder provides 13 dates for one year and the exact time on that day at which the fertility peaks, which is of course the exact moment when the Sun and Moon are equi-distant to their position at birth. After entering your client's birth data and enter the Radix screen, click on "PLUG-INS" and pull up the Fertility Chart. Input the starting date and the city where your client will be for that year. (If the couple travels, it is up to you to show them how to re-adjust the given time. For example: 7:00 am EST in New York = 12 noon UT in London).

Pathfinder will automatically run all 13 charts for the 13 times given (or run as few as you wish). Even though computers and software programs are very reliable, we who input the data are humans and as such we do err. PLEASE check to make sure that the distance between the Sun and Moon is the same as it is in the natal chart. Pathfinder gives you the exact distance on its main print-out of the 13 dates and times. It will also spell it out when you print a single chart, but not when it runs all 13 automatically. (But as an experienced astrologer, you can eyeball the approximate astrological distance, such as 'should be nearly a trine' or 'a bit more than a square').

Since the Fertility Cycle emulates the natural ovulation, I found it helpful to use similar rules to what doctors recommend. They state that the highest potency, when the egg is ready to be impregnated, lasts about one day or around 20 hours. To be on the safe side, I tighten the astrological period to about 16 hours and find it best to schedule intercourse before the fertility peak. But at times you have no choice and need to go past, but not for too long, whereas you can go for a good 16 hours beforehand. After carefully studying the charts, I consult with the client as to which of the 13 possible days are deemed good, which are fair to middling, and which I consider problematic.

Rules for Interpreting Fertility Charts:

The rules are basically very simple. In its own way, this is a type of Electional Chart, and since we are dealing with conception, everything is based on the Moon. (If you are not familiar with electional rules, check The Only Way to .. Learn about Horary and Electional Astrology or any other electional astrology book you acn find). Primarily, check all the applying aspects the Moon makes in the chart and then (but much less important), the aspects it makes to the natal chart. As in most electional charts avoid Lunar squares and definitely avoid squares from the Moon to Mars, Saturn and Uranus. I also try to stay away from Moon opposing Saturn (delays, separations, possible health complications) or Uranus (unexpected or sudden events).

Squares are challenges you wish to avoid for your client, but obviously a square to Venus or Mercury will not be as hard to handle as one to Mars. As always, your astrological interpretation and judgment will be as good as your knowledge and experience. Oppositions often just mean delays which can be handled, except for Saturn and Uranus, as stated before. Mars should also be studied carefuly. Quincunxes, so important in natal interpretations, seem to play a rather minor role in electional and fertility work.

Also realize that electional charts cannot, and should not be interpreted as if they were natal horoscopes. No humanitarian or psychological options. This is a moment in time chosen for the act of procreation, so use all the old-time rules. Saturn and Mars are 'bad' while Jupiter and Venus are 'good'. Another rather significant electional rule concerns the Void of Course Moon. The usual wisdom is that nothing will happen, therefore no pregnancy should occur. I'm still checking this phenomena for accuracy. I usually tell the client to try, since nothing bad could happen. So far I have had only one pregnancy which occurred during a void of course Moon, and at that we'll never know if the semen reached the egg so late that the Mon had entered the next sign.

I have another question mark which I have not as yet answered to my satisfaction: Pluto? It stands for procreation, but in the fertility chart is it beneficial or not? I definitely avoid it when squaring the Moon. So far it has not shown to be a problem when in opposition, but I have had a case of triplets with a Moon/Pluto conjunction and a very long (2 weeks late) pregnancy with another conjunction.

Many questions also arise regarding the Ascendant (the MC is less important with Fertility charts). The Ascendant is faster than the Moon, since it advances one degree every four minutes, while the Moon needs two hours per degree. Therefore the Ascendant should apply to the Moon and all the other planets -- whereas most astrologers do the reverse. I have tried both and have found that I rarely use either. Only in very difficult situations, where I have hardly any good days in the year, will I use the Ascendant.

Realize that even the so-called beautiful fertility moments may not result in a pregnancy. What looked perfect may come up empty and what looked so-so may result in a lovely baby. That's nature, and thank God we, the astrologers, can only try but not know all the answers. My success rate with so-called healthy parents has been about 70%, which is good enough for me.

Certain facts will become very obvious with experience. Certain natal charts can be harder to work with. A natal Sun/Moon square will have to be out of the way in order to have a successful pregnancy, therefore you need days where there are good aspects after the square, and this often leads to a dirth of good fertility dates. Sometimes no more than two good dates in one year.

Since most women have used articifical birth controls, as well as other medications, very few are in synch with the fertility cycle, which can actually occur while the woman is menstruating. This is not a problem and intercourse should proceed. In fact I have had two cases where it resulted in a pregnancy, and I have heard of similar experiences from women in my audience during my lectures or workshops.

As I do with every client, I also counsel that she follow her natural ovulation with a temperature chart or however her doctor suggests and that she and her mate take advantage of that day as well. In fact make sure that you NEVER contradict the doctors, your client needs to trust them, as well as you, especially if you are working with some of the new fertility procedures.

Once I have studied the 13 charts, I discuss (in person, by phone, by mail) all of them with the client, including some possible problems. We also talk about the fact that some men have problems performing on command at a set time. Sometimes I advise her not to share the time schedule with her partner. If both are involved, I may suggest that they have a party or somehow celebrate the event, anything to avoid stiffness or embarrassment.

Please remember that the fertility charts are just what the name implies -- they have nothing to do with the possible time or manner of birth, nor do they even remotely resemble the birth chart of the baby. (The 100 plus charts of actual conception versus the baby's natal chart have none of the magic similes expected or wished for by old time astrologers. Even the actual moment of merging of semen and egg, as done in vitro, does not yield great resemblance between that horoscope and the baby's).

Once the client becomes pregnant, then that chart becomes the pregnancy chart. Even then it has nothing to do with the baby's birth, but it rather accurately describes the pregnancy itself, including some possibly difficult areas. At that time the interpretation is like any other event delineation. Since the Ascendant describes the client and her physical body, the Ascendant ruler assumes quite a bit of emphasis and its aspects become meaningful as the pregnancy develops.

As to predetermining the baby's gender -- the answer is maybe, but should be NO. A male Moon (Aries, Gemini, Leo, Libra, Sagittarius, Aquarius) should produce a boy, a female Moon should result in a girl. But we never quite know how long it takes the semen to reach the egg. Therefore it becomes impossible to age and you should not promise the client anything! Remember, it can take the semen more than 60 days (as much as 72) hours to fertilize an egg; in that time span the Moon may have entered the next sign.


Approximately 7 million Americans of varying socio-economic profiles suffer from infertility right now, meaning they have been unable to conceive a child after one year of unprotected, regular intercourse. Of those 50% can get pregnant by procedures that are neither invasive nor exotic, such as the astrological fertility cycle, or if under a doctor's care, by finding their own ovulation periods, limiting or eliminating their use of alcohol, medications, drugs and cigarettes. The other, more serious problems, turn out to be low male sperm count, tubal blockage, infrequent ovulation, cervical chemistry hostile to sperm and, of course, the age of the mother to be.

Fertility drugs have been around quite a while, but there are so many new and diverse approaches and I have found that we as astrologers, can be of much help. Here are the most commonly used methodologies:

  • Artificial insemination (inseminating the woman with her partners 'washed' sperm). Cost between $1000 and $4000.
  • In Vitro Fertilization (woman's egg is removed from a ripe follicle, fertilized in a dish in the laboratory, allowed to divide and reinserted into the woman's uterus). Cost is very high, mostly between $6000 and $10,000
  • GIFT and ZIFT (or Gamete and Zygote Intrafallopian Transfer ( In GIFT the egg is removed, immediately mixed with the washed sperm, reinserted into the woman's fallopian tubes in hopes that fertilization will occur. In ZIFT a fertilized embryo is returned to the tube. Add anther $1000 or so to the In VItro cost. (The above are all '96-'97 prices).


There are many variations within these procedures (intera-uterine insemination, intera-tubal insemination, subzonal insertion aka SUZI) and new ones added on a daily basis. However, all the ones I have worked with depend on the woman's ovulation dates. I rarely see the male mates or spouses involved, they have been relegated to the sole task of producing the sperm and into a tube at that, without the fun of sex.

In most of the cases the doctor gives the patient a 'window' of 12 to 36 hours as to when she wants to have the procedure done. That is the only time span we, the astrologers, have to work with. At this point we can do an electional chart to help the client find the best time available within the 12 to 36 hours. Fertility has become such a specialized field, that all kinds of clinics have sprung up, many of them open at all times of the day and night. Most of my clients, none of them emergency cases, have given me a 14 hour day to work with -- from 6:00 am to 8:00 pm. Even longer hours are available, if necessary.

Please realize, this is only a beginning. It is up to many of you to continue researching the subject, but I have found that the closer that insemination was to the astrological fertility date, the better were the results.

Quite a few times I was able to convince my client to skip a month, realizing that her natural ovulation was moving toward the astrological peak day. This can happen rather frequently, since many women do not ovulate every 29 1/2 days, as the fertility cycle takes.

Another intriguing bit of learning came with the realization that it does not seem to matter when the eggs are taken from the ovaries, or when the husband's sperm is added, it does not even matter when the eggs become fertile, the moment that checks out time and again is when the fertilized egg is implanted. The same goes for artificial insemination. It does not matter when the semen is given, only when it gets implanted.

These are just few ideas to get you started on the interesting journey of the future, because I think that the 21st Century may bring us many more problems of child bearing. If you need real life examples, you can find some in Volume 6 of The Only Way to.. Learn Astrology series.

DISCLAIMER: All information provided herein is based upon original research methods used by Marion D. March. It is written with reliable intent. The purpose is to inform, educate, and make available tools for individual research. It is not intended to be a substitute for LPN programs. Although these methods have worked reliably in the past, not enough actual cases have been handled, there can be and therefore is no guarantee whatsoever that they will work in the future. Therefore neither the author, publisher nor programmers connected with the Fertility Cycle Program or manual assume any responsibility whatsoever.

The Pathfinder Plus Astrology System, which has the option to calculate and print out the Fertility Cycles according to these methods described by Marion March, is available:

  • for England, USA and Canada: click here (or email john@astrocye.com)
  • for the Netherlands and Belgium: click here (with Dutch manual)

PATHFINDER is the Windows-Based Astrology System for Professional Astrologers. Developed by John Woodsmall, of Astro-Cybernetics (Los Angeles/London) , with design assistance from Raymond A. Merriman of the 'Merriman Market Analyst, Inc."  It is wholly supported by the maker of this site who has used and is using this program since 1997 for all astrology work.

"This is a GREAT program - its looks, its beautiful screen color options, its ability to change the size of the glyphs, and the fact that it is logical and easy to use. I love the biographical features which accomodate 'The Only Way to Learn Astrology" methods. The "Pathfinder Windows" program is definitely the primary astrology system I now use in my practice".

-Marion D. March, professional astrologer.

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