The old calculations were done in reference to the stars themselves, the nakshatra. It’s just that the current formulas are very very accurate and not really as much in need of periodic updating as the more general estimations of the Surya Siddhanta were. However, it is essentially the same as the old system – based on observing the planetary motions, creating mathematical descriptions of those motions, and using those formulas to know the position of any planet at any point in the future or past. As such it is far more accurate to the fine details. The modern method benefits from centuries of mathematical refinement and improvement in our observational tools. This has not been done for a very long time, though, because we stopped using this estimative method a long time and moved to new methods more based on direct observation. The Surya Siddhata advises to do this – rechecking the planetary motion and resetting the reference point – and calls the reset-values ‘bijam’ or ‘seeds’ which keep the calculations acceptably accurate.
If you want to be more precise you have to periodically recheck the cars speed and reset the reference points to less remote times. Then, knowing how much a given planet moves each day on average, you can estimate where the planet is on any given day before or after the beginning of Kali Yuga.Īs you can tell this is a system of estimates only, it is not precise. The main reference point for calculations, used by Surya Siddhanta is the planetary alignment at the beginning of Kali Yuga (the current Age of the world).
4 hours ago it was 20 miles south of the reference point. 1 hour ago it was 40 miles north, currently it is 60 miles north.
If you know a car moves north at 20 miles per hour on average, and you know that 3 hours ago it was at the intersection of 4th street and 5th avenue, you can predict reasonably well that 2 hours ago it was 20 miles north of that point. Here is an example to make it easier to grasp. Using that math, from a given point of time as a reference one could extrapolate where the planets would be in reference to the stars at any other given time previous to or after the point of reference. After making such observations carefully for many years ancient scientists developed math which described the motions of the planets reasonably well. It was done by looking up at the sky and practically observing how fast and slow the planets move through the stars – when they become erratic and move backward, and how they slow down and speed up. Let’s talk about how it was done in the old days (and this is the recorded method in Surya Siddhanta). What i will describe here is actually the way the epemeris and tables of houses are created, in ancient and modern times. I am not going to mention Ephemeris and Tables of Houses – which we few remaining souls who have enjoyed calculating charts by hand sometimes will remember fondly – because these are just the output of the calculations put into a handy reference format. So I will explain the basic overview of how it is done, from an ancient and modern viewpoint. If we don’t know how a chart is calculated we miss out on very edifying fundamental astrological knowledge. We ought to know how it is done, at least have some idea of it.
#TROPICAL ASTROLOGY CHART CALCULATOR SOFTWARE#
These days, computer software written by someone we barely know, if at all, calculates astrological charts for us.
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