Ptolemy says:
The consideration of the length of life takes the leading place among inquiries about events following birth, for, as the ancient says, it is ridiculous to attach particular predictions to one who, by the constitution of the years of his life, will never attain at all to the time of the predicted events.
It is therefore appropriate to be able to answer the question of what age the native will live. This information is for us, not for the client. It has long been doing research on ancient astrological methods. I examine their potential, truthfulness.
Sample of 100 children was studied in question 3 category of birth. It's not much, but it can make a statement.
Functionality and methods hyleg ? alkochoden and almudebit is from my view and experience demonstrated. Course, the result may not always be perfect.
Variations may occur due to incorrect birth time, poor estimation or insufficient knowledge of the properties of individual elements of the chart, and finally a number of circumstances, that we may not be at the level of our knowledge or understanding available. It is important to use these methods with caution, as possible indicators and not absolute. This is an estimate attributed vital force and not a determination of whether a child or a person dies near specified time.
Even if they met all the conditions given category does not mean that child has to die, but is a high probability that it will be strongly handicapped.
Modern medicine can rescue and prolong life in many cases where it at an earlier time was not possible. The question is in what quality.
My thesis is available at (unfortunately only in my native language):
http://fragmenty.johannes.cz/
As for the primary direction.
Technique primary direction had originally dual purpose:
1) Description of human life from birth to death. It was a continuous the time course.
The basic method used to determine the ruler of the time (chronocrators) for the whole period of life.
The basis was the primary direction to the term and the second factor has been applied primary direction to the body and aspect of planets.
2) Determination of the only events in a person's life and that of his death. In this case it is only a single discrete time period. Ptolemy writes about this in part III. Tetrabiblos.
The first basic use was gradually forgotten.
Primary directions(described in point 1) are the first step prediction for many ancient astrologers. Similarly Firdaria or other techniques. They are inextricably bound up with the solar revolution, profection when prediction.
Primary directions are many types. I am using the most primary zodiacal directions without latitude to the angles and I add, when I rectify birth time, mundo parallels. Key Naiboda gives me the best results.