Successful pregnancies


AstroSecret - the perfect mobile app for women

AstroSecret offers you a unique calendar for improving the chance of conceiving.

We link a regular period tracker to natural Lunar cycle to work out your most favorable days for planning pregnancy.

This method was discovered by Dr. Eugen Jonas during the middle of the last century, and it’s already proven to be highly successful for thousands of couples around the world. 

AstroSecret will help calculate the best potential conception dates, so you get a harmonious pregnancy.

AstroSecret  will be a useful tool for all women who wants to mark their physiological cycle or plan a pregnancy, but especially for those, who long periods without medical indications are unable to get pregnant.

Dr. Jonas found also a method to predict a baby's potential gender with a 70-80% success rate.



Why do you choose AstroSecret?

There are free and paid features with the AstroSecret app. These paid features allow full access to the functionality on the app. These features include:

Disclose the most favorable fertile days

Favorable days when change location or travelling

period calendar

Potentially predict your baby’s gender

See your potential baby’s horoscope

Period tracker

Simple and stylish period tracker

Fertility days

Regular fertility and ovulation day planner


Remainders for all important days

Important days

Notes of intimacy

Special day

Note of getting pregnant


Help from AstroSecret support team



Determining your fertile days is just the first step to a favorable pregnancy.

For ideal planned pregnancies, both partners should prepare at least nine months prior to conception

This calendar is a great mentor to help you live according to the rhythm’s of nature to purify and prepare the body for your baby’s arrival.


You need to pay attention to your own well-being before conceiving!


Take care of your body by being:

  • Physically healthy: follow a healthy diet and take part in exercise

  • Emotionally healthy: devote more time doing things you enjoy

  • Satisfied with your social status, work and family relationships.


Do you have any questions about AstroSecret?

Our team would love to hear your feedback and comments, and will answer all your app questions. Thank you! :)


It is a woman period tracker and pregnancy planning calendar based on the positive days for conception according to Lunar cycle calendar. The method used in application was discovered already in 1956 and it was done by a scientist, doctor Dr. Eugen Jonas.

AstroSecret team did complex programming jobs so the calculations would be available to every woman in a comfortable way, by using an enjoyable and simple smartphone application. 

AstroSecret is created for any woman who plans pregnancy and wants to know the most favorable periods for conceiving a child. But especially we recommend AstroSecret to women who cannot or have had trouble getting pregnant.

Before starting to use the AstroSecret application, make sure that you are physically healthy. 

In the development of this application participated professional medicine specialists who combined their knowledge and created a professional helper to determine the positive days for conceiving by using indicators of physiologic cycle and Lunar calculations. 

To make difficult and complex calculation system available to every modern day life woman who wishes to use a power of nature to determine the most favorable dates for conceiving a child.

By knowing these dates it is possible not only to better conceive the baby but also prepare for the conceiving a while before by living a healthy lifestyle, doing sports or other desirable physical activities and also by following a balanced, healthy diet. 

Dr. Eugen Jonas was born in 1928 and currently lives in Slovakia. In the middle of 1950 he studied medicine and additionally was interested in astronomy. The idea about developing a new method for fertility was born when the new student while learning for class found an ancient Assyrian handwriting and read a phrase: “A woman is fertile in the period of a particular Moon phase.”

Based on this information Jonas did an in depth research and countless calculations until the 15th of August 1965 he discovered something completely new in the world and science – additionally to the hormonal cycle women also have a fertility cycle in which there is ovulation.

Jonas called it a spontaneous ovulation. In this way Dr. Jonas explained the conception cases that didn’t fit into the traditional ovulation cycle.

In the beginning Dr. Jonas successfully checked his assumptions and proved them by examining data of women who had already given birth and calculating the possible dates of conceiving after the parameters of baby’s birth. After that he made a long-term cooperation with the leading gynecology and obstetrics hospital of Czechoslovakia in Prague that was ready to cooperate with young Dr. Jonas and invited him to do full time research about the method.

For the contributed work and results Dr. Eugen Jonas was nominated twice for receiving Nobel Prize in 1970 in America and 2000 in Argentina. 

Dr. E. Jonas claims that there are two cycles that allow for a woman to conceive:

- Hormonal cycle that is connected with ovulation that happens around the middle of two menstrual cycles (in application AstroSecret these days are marked as “Fertility prediction”),

- Lunar cycle that is connected with the position of the Sun and the Moon in the time of woman’s birth (in application AstroSecret these days are marked with yellow dates and named “AstroSecret Special day”).

Both cycles are completely independent from each other. In accordance with the research done by Dr. Jonas, 85% of the conceiving cases happen in the lunar cycle.

If both cycles - hormonal and lunar overlap, the chance of pregnancy is 99%.

Since 1956 the method was checked and confirmed with the participation of thousands of couples who were invited to participate in the developing of method. Research continued for more than 46 years and with its help a significant amount of newborns came into this world.

Dr. Jonas also developed parameters by which the baby’s sex can be determined. The preciseness of the prognosis has been positive in 70-80 % of the time. 

The research of about Dr. E. Jonas lunar fertility method confirm that:

- Method is precise in 98 % of cases,

- 2/3 of women who couldn’t conceive before without medical indications got pregnant in the first year of using this method,  

- 1/3 – in the second year.

The yellow date or AstroSecret Special day is determined after Dr. Jonas method as an especially favorable Lunar cycle day for conceiving. If this day overlaps the fertile day by the hormonal cycle, chances of getting pregnant are 99%. 

Dates that are colored white or the AstroSecret days are good evaluated all fertile days according to the physiological cycle.

The numbers indicate the overall favorable aspects in that day. The bigger the number, the more favorable is the day.

No, it isn’t so. This day is also favorable for conceiving, because in AstroSecret application there are shown only the favorable days.

In cycle where there are only white days, the AstroSecret special day wasn’t favorable for conceiving. It means that in that day there are more negative indicator than positive, which is why the application didn’t show this day.

It means that in the particular period there are combinations of different parameters that aren’t favorable for pregnancy. This application is exactly for those women, to provide a tool that helps not to let pass the favorable moment for conceiving.

There is always a chance to go to a medical specialist individually to solve the situation that bothers you. 

By pressing on AstroSecret yellow or white day circle there shows the predicted sex and horoscope sign of the baby.

In these days the indicators of predicted baby’s sex can change. Since we cannot know the precise time of conceiving, in these days the predicted sex of the baby isn’t shown.

Yes, of course! Since AstroSecret or the white days are the fertility days according to the physiological cycle, in these days there definitely is a chance of conceiving. Especially if it has a high index of positive aspects.

When the menstruation dates change, AstroSecret special days cannot change or show again. They can show from new or disappear only if you change your location and time zone with it.

Yes, it is possible. You can indicate the average cycle length in the app settings. Also you can indicate for the program to automatically calculate the average cycle length for the last 6 months if you have saved this time period in calendar or plan to do so.

It is also possible to indicate the earliest and latest of the known ovulation days if you follow to your ovulation cycle. If you don’t do that, the program will automatically determine the prognosis of fertility days according to physiological cycle. 

The date of birth is very important because it is the foundation for many calculations that indicate the favorability of fertility days and also helps to calculate AstroSecret special or the yellow calendar dates.

The more precise is the time of birth, the more precise will be the AstroSecret application.

Yes, it can. It means that when going traveling or changing place of living, the position of planets against the birth map will also change. So the calculated indicators will also change. If you have to move a lot in your life time, in this way it is possible to also determine the best possible place on earth where to conceive a baby.

AstroSecret developers think that a woman has the right to choose when she wants to have a baby. That’s why there no time limits are set.

AstroSecret special day is indicated after the method of Dr. E. Jonas, with which he discovered the woman’s ability to conceive a child even outside the fertility days of physiological cycle. That explains the cases when women get pregnant in the so called safe days as well. He has called this the Lunar cycle because it is calculated after the woman’s data of birth.

Today approximately a million couples have successfully used this method.