Mathematics Of 'The Round Art'.
Just wondering, who knows what about the math involved with Astrology? I would like to develope a good understanding of how to cast a Natal Chart without referencing to tables. I'd like to make my own. And considdering this idea of incorperating a 13th Sign into the Zodiac, I'll have to understand good and well exactly how to calculate every aspect of everything involved. I'm asking the people because a multitude of perspectives is useful to me. Also, any alternate kinds of Astrology and how they work or tidbits anyone can give me is something I'll be after, too.
Love and Will
Love and Will
If you can program, theres all the stuff you need at Swiss Ephemeris
Hope I am not telling you stuff you already know. But the astrological sign is a neat way of labelling what astronomers call the Right Ascendant or celestial deviation from Aries (0) or the Vernal Equinox.
I use a library, since the Swiss Ephemeris software library is quite large and complex I looked around for a simpler subset that was just relevant to Astrology, I couldn't find it.
After some more digging I discovered that what you are after to determine the 'zodiacal sign' is an accurate measure of the Right Ascendant of the planetary body in degrees. After this then you just need an index into each sign in order so that Aries signifies (0-30 degrees, Taurus (30-59) ... until Pisces (330 - 359).
If you want to have 13 signs then you would have to change the angle of separation from the convenient 30 degrees it has been since the Babl onions to a more accurate 27 degrees. But hopefully you wouldn't be screwing around with the accumulated wisdom that has already been achieved with the measure as it was. It is a bit like trying to change from Imperialist to Metric measure. But why you want to do this, I don't know. Are you being awkward?
Oops I posted that, as a guest. And I would make a couple of corrections :-
You need the Right Ascension of each Planet and the Moon (not ascendant).
Also, 13 signs sounds interesting, since there are 13 lunar cycles per year. But because the mechanism is not a Swiss Watch, there are not EXACTLY 13 moons so things drift off by about almost 1 day per year. Instead of the current convention of allowing 1 day every 4. Is that right? Something like that.
The trouble with astrology is that you need to be accurate just for the boundary conditions. There is a few seconds between the Moon going from Aries into Taurus, and to work this out, apparently you need to know the correct UTC time and have an observational latitude and longitude. To get the correct UTC time is not easy peasy. Some time zones are half hour different. Some are different within legal boundaries. So you need a database of timezones differences from Greenwich. How you calculate Right Ascension, I don't know.
So this is a long way of not answering your question.
It is a bit like trying to change from Imperialist to Metric measure. But why you want to do this, I don't know. Are you being awkward?
Perhaps I am being a little awkward, but I'm searching for something and bound to have difficult stages. Yes, I guess I'm toying with already established knowledge, but this method of exploration based on theory is essential to human growth. And my theory or hope is that I can establish a more accurate Astrology, wheather others' choose to embrace it is of no matter to me essentially, so long as I find what I'm looking for. And if I don't, I'm sure much will still have been learned in the venture.
"Question everything. Believe in nothing; beliefs are the sign of a non-functioning mind. " - Dr. Timothy Leary
Thanks for all you have contributed. It does help.
Yes, I guess I'm toying with already established knowledge,
The audacity! Silly dear, I bet you'll next be spouting the world is round and other such rubbish. Pshh...
but this method of exploration based on theory is essential to human growth. And my theory or hope is that I can establish a more accurate Astrology, wheather others' choose to embrace it is of no matter to me essentially, so long as I find what I'm looking for. And if I don't, I'm sure much will still have been learned in the venture.
I'll be your first client for a lunar calendar natal chart.
Awesome, indeed! First ones' on the house. 8)
There is a 13th sign. (I take out my trusty star map by Noel Tyl). I trace the path of the Sun around the earth - this is a geocentric universe - when I said diff'rent I had trouble with the inquisition .... 👿
Between Scorpio and Sagittarius lies the constellation of Ophiochus, a matter of about 10 degrees, but it is there.
Its sigil is like the Mercury caduceus and represents something similar to Lilith - the feminine returning as strength. The yin rebalancing the yang, (indeed).
Some say that this does not matter, that the zodiac is conveniently divided into 12 and that the exact star patterns are not relevant when talking about universal energies, but, with my Mercury and Pluto conjunct, I err on the side of 'pedantic'.
Although Ophiuchus intersects the ecliptic, it is not a zodiacal sign in astrology. The signs are defined as 30-degree segments of the ecliptic, of which there are only twelve, and they are named after nearby constellations at the time the system was developed, rather than being defined by the constellations.
However, as Uranus, Neptune and Pluto were discovered relatively recently, and added much more to the astrologers vocabulary, an awareness of this 13th constellation shall no doubt do likewise.
Being an astrologer dabbling a bit both in astrophysics and computer programming, I have aquired the formulas needed for the necessary calculations from a variety of places. I am also a trained ship's navigator, who, rather than use formulas, simply peruse a yearly-published "Nautical Almanac" to find the planet's poitions.
The method of calculating house cusps is a different story, there is a different set of equations for each house method, one for Regiomontanus, one for Koch, and so on.
Grant mentions the 13th sign (which is a spider) and who discovered it, very breifly, in OTCOT.
In the early 80s a friend of mine created a new system for drawing up horoscopes using 13 signs including 'Arachnos' the Spider. As far as I know he had not read anything by Grant, so I presume that he came across the same source.
If I remember right he also changed the symbolic meanings of several planets too. His results were thought provokingly good without being totally mind-blowing. He did give me a list of dates that "will be significant to you" but the last time I checked those that had gone past were not especially notable. Unfortunately he got bored of astrology fairly quickly (one of those grasshopper minded over-acheivers) and got rid of all his notes.