As different aspects of the same ancient science, neither one can fully exist without the other. Most people think there is something to Astrology, but mainstream science claims there is no proof: no way to measure, and no way to predict how anyone's love life is going to go three weeks from now. But what if there was?
While some Astrology is intentionally vague, much is well intentioned. A natal chart may seem optimistic at a person's birth, but much less accurate later on in life - yet perhaps it's simply that more consideration was given to known variables, and all the ramifications were not fully understood.
A chart which predicts a great artist may belong to a person who is merely somewhat creative. The Astrologer may not have calculated everything relevant to that specific situation - thus the interpretation is merely incomplete. So perhaps that cosmic configuration which traditionally predicts a strong artistic personality is not about how much talent a person has, but finesse, individuality, or a prevalent eclectic taste.
To be fully comprehensive, especially in a subject as grand as the cosmos, a great many variables must be taken into account. But quite an undertaking is required, to develop Astrology as a science: honestly and accurately defining the personalities of millions of people over hundreds of years; charting even the minor changes in their lives; then correlating by common astrological configurations at birth, and throughout their lives - then perhaps we would begin to know more about how the stars seem to have an effect on us, and have an idea where to look for what's missing in that knowledge: what exotic cosmic force yet undiscovered.
Perhaps it was simple superstition which bore Astrology - primitive people trying to make some sense of the chaos in their lives: inventing gods and blaming comets for disasters. But part of the reason why ancient oracles were so successful is that they had spies, and accumulated vital intelligence before making crucial predictions.
Another modern revelation: earthquakes and volcanic eruptions can sometimes be predicted to occur within a few days (usually after) of a full moon, new moon, or especially an eclipse - when the Moon sweeps so close to Earth, more or less right over an already fragile fault-line. In that situation, the wildcard is gravity: just enough to power the tides, and the straw that breaks the camel's back. Many other unknown variables are at work, however; but the ability to detect minor quakes all over the world, and make the connection, requires a technology which has only recently emerged - in a time when such things are taken less than seriously.
If Astrology is the science of predicting any possible effect that certain cosmic forces may have on our lives, perhaps a more realistic approach is possible, now that we understand more about Astronomy. Within the ancients' purview were things like Rising Star and Saturn return; which have proven to be of some merit over time - but what could the mere presence of a planet in one sign, as opposed to another, have on a personality - and, if so, is it really possible to use this knowledge to predict the future?
Some believe that Astrology is but a small part of what little knowledge is left to us from the ancient civilization of Atlantis - that they knew some things which we yet do not; and that they were more in touch with the natural world than we are today. Ancient seafaring cultures knew the sky well: dividing by three, then four, thus twelve, and ultimately 360 (very close to the number of days in a year, 365), would be the first most basic step in understanding where you are, whatever time of year it is.
The Zodiac is comprised of the twelve constellations which are on the equator of the sky - the solar plane, or path in which the Sun and Moon and all the Planets revolve around us, from the ancients' perspective. Think of it as a giant clock, surrounding our solar system (with constellations instead of hours), which Astrology measures fairly equally, somewhat different from modern Astronomy. But essentially, these groupings of stars in our sky seem to have a personality of their own, and certain aesthetic relationships to each other; as do all constellations, throughout the entire sky.
Most of what we know about stars comes from analyzing the light we see, or radiation emanating outward from it. Each star acts like a beacon of energy, or a laser beam, sending all kinds of radiation out into the universe, each source having its own unique blend, a specific complex bandwidth signature, that can be analyzed and predicted - sometimes changing, however, depending on the star's personal customized circumstance. But any given area of sky contains many bright stars, like different symphonies with different musicians and different performances. Virgo, for example, is host to the Virgo Cluster: numerous galaxies, the light from which journeyed millions of years across the intergalactic void. Different intensities, frequencies, combinations: a cacophony of light and energy from the universe - each day a slightly different version of the same lightshow.
But even the brightest and closest stars are very far away; and the sum total of all measurable energy is less than that of a single snowflake landing on the ground. How can they have any effect on us whatsoever? The combined gravitational effect of all the other Planets in the solar system is less than negligible - but the Planet Earth is very much an integral part of the solar system, even if its absence would go relatively unnoticed on any scale we are yet able to measure.
Compared to stars and planets, we're sensitive, fragile, vulnerable, biochemical, electrical creatures; and these cosmic forces are entirely physical in nature. Perhaps if we had the ability to measure them, we'd see that they're everywhere and a part of everything - and have a measurable effect on aspects of our lives and personality, in such a way that science has yet to discover. These cosmic vibrations are believed to also pertain to inanimate objects; and some schools of thought insist that nothing is purely inanimate - even rocks, or for that matter, computers.
Most Planets are bright enough to see with the naked eye, acting as giant mirrors of our own sun - they reflect and refract this energy, and that of the other planets - and also energy coming from outside the solar system - each a little differently, depending on their composition, distance, and presumably many other variables. When a Star or Planet is behind the Sun, we receive no direct energy from it; and perhaps it is missed. What constellation the Sun is in, at any given time of year, may determine which constellation of energy is missing, or blocked.
Besides the sun, the most noticeable influence is the Moon - and we are somewhat affected by what phase it's in (especially Full Moon, New Moon, or an Eclipse). We are accustomed to these cycles, and are perhaps particularly identified and acclimated to how the sky was in our first moments of life (or perhaps the moment when we were conceived should be taken into some account, as well). When these constellations and planets return to their places of origin, we may feel the most comfortable, and better acclimated to daily life. In contrast, when stars and planets configure in unfamiliar relationships, we may feel out of sync.
When planets go into Retrograde (change direction in the sky, from our perspective), our delicate biochemistry may receive unexpected vibrations. The symphony may seem discordant for a time - as if, suddenly, one or more instruments began playing their pieces differently, out of key, or even backwards for a while. If we are particularly identified with the planet in question, we may be particularly affected. Mercury in Retrograde is generally considered a bad time to make business decisions - and people born during a Mercury Retrograde may be normally restless (unless Mercury happens to be in Retrograde, which is relatively rare).
Signs where there are not very many bright stars, but a wealth of interesting deep sky objects (like galaxies, nebulae or assorted star clusters) may be less about the light emanating from the Milky Way, or the rest of the Galaxy, and more about local dynamics, further radiations being somewhat obscured. Someone born at night, and under the very rare circumstance of having no planets overhead, but the countless galaxies of the Virgo cluster rising or at zenith (perhaps with a New Moon) might be particularly intuitive, and sensitive to the subtle nuances of other stellar dynamics, and thus seem perhaps an unpredictable personality to most people.
Capricorn - Cardinal Earth Sign
Full Moon in Leo, Rising