Progressions in Timing Solution
A progression is one of the most used prediction techniques in Astrology. According to classics, one day in progression chart corresponds to the whole year in our real life. In other words we can observe a life in some artificial time that flows 365.24 slower than our real life time.
And the most of astrological programs use this idea directly dividing somebody's age on 365.24; this is how the progressive chart's time is calculated.
It was not so to ancient astrologers. They viewed the progressive chart differently. For them, the main measure of the time was a real position of the Sun, and they understood the difference between the calendar time and the astronomical time.
The main principle of the ancient science was the similarity principle (Hermes principle, "As above, so below").
So dealing with progressions we should consider two cycles: a year and a day. The first cycle (a year) comes from the Sun moving through Ecliptic. This is an exact astronomical year, not an averaged year. Here is an example: my Sun is in 22 degrees of Capricorn. If we consider two moments: 1) the Sun passes 22nd degree of Capricorn (this is my birthday); and 2) the Sun passes 22nd degree of Cancer, the interval between these two events 1 and 2 is exactly a half of the astronomical year. However, due to non-even movement of the Sun within this interval, it is not exactly 177.6... days of the averaged (calendar) year.
So, when we speak about the progressions, the main question is how we measure the time. Consider this question: what does it mean: one year? The modern science uses as a measure 365.24 days (1 day = 24 hours,1 hour = 60 min, 1 min = 60 sec while 1 sec is something else). For the ancient astrologer, a year is a period when the Sun passes the same place of Zodiac.
The same situation is with the other cycle, a day. The ancient astrologer sees it as a whole diurnal cycle of the Sun: the Sun's rise, culmination, set, anti culmination and the next rise.
Thus the measure of the first cycle in question is the Sun's position in Zodiac. The second cycle is formed by the Sun's position in houses (in Mundo Zodiac).
Consider one more example. Suppose you calculate the progressive chart for 10.5 year old child. The modern astrologers do it easily: they count the exact age of this child, lets say it is exactly 10.5 years, and then they calculate the chart 10 days and 12 hours after the birth time. It will be the progressive chart.
How would some ancient astrologer handle this task? He would look at the sky and define the exact Sun position. This way he would calculate the exact path that the Sun made since the birthday of this kid. It will be the exact astronomical age of the kid. The time here is measured not by the atomic clock, but by the Sun's movement. Because the Sun moves not evenly, it will differ from 10.5 years, let say it will be 10.495 years (10.495 full Sun cycles).
Next step is to calculate the chart 10.495 days after the birthday. And here one more problem appears: the ancient day and night houses had different length. The closest to the ancient time is the Sun's position in transiting houses, i.e. the Sun In Mundo Zodiac. So we should calculate the moment when the Sun makes 10.495 cycles In Mundo Zodiac. This type of calculating the progressions was suggested by my friend, Russian physicist Dmitry Osipov, and I find it the most accurate method known to me.
The advantage of this approach is that it provides the mathematically correct analogy between a year and a day. Instead of averaging, the real proportions of the year and the day are kept, in accordance with Hermetic principle.