Astrology is like a reflection...
(Q)~
The same force that moves the planets, move us.
you tell me,
what does move our planets, satellites, asteroids, etc? this is where the debate of "God" could come in, but I really don't want to lead this discussion there...Gravity is a part of it, but what
motivates the movement, do we know?
This is what I don’t understand. Planets are millions of miles away from us and have been and will continue to orbit the Sun for millions, if not billions of years. A very tiny bit of gravitational pull is about the only influence they can have on the Earth and each other, aside from the joy we might get from viewing them with a telescope.
see my comment above...astrology is a theory obviously at this point, but those who study it long enough begin to understand it's "language"...
What would happen, for example, if a large brown dwarf rogue made its way into our solar system and completely destroyed one of the key planets used in astrology? And what if this collision had such an effect as to knock other surrounding planets out of their orbits? Would astrology need to be re-written?
i guess we will find out what happens if and when that happens...astrology does not claim to be the final answer...which leads me to your next question...
Why couldn’t one simply gain knowledge of strengths, weaknesses and tendencies from studying people instead?
i do study people along with their birth information and compare their tendencies, etc with the aspects in their chart...more often then not, people are a match to their chart...
Tom~
Is there some systematic way to determine these these strengths, weaknesses, and tendencies? What input data do you use (birthday, etc)?
for the natal chart, I use the birthdate, the EXACT time and EXACT place of birth (latitude and longitude) to calculate where the planets were in relation to the person at the time of their birth...now, one could argue why the chart is not calculated at the time of conception, and my answer to that would be that the fetus does not have free will until it is completely separate from their mother...most astrologers now use a computer program to input the birth information, as hand calculating takes a long time..
You said that the foundation of astrology is that the same force that moves the planets also moves us. From this principle, how are claims regarding our strengths, weaknesses, and tendencies logically deduced?
i deduce them by comparison of the aspects to the individual, or event (astrology can be used for a an event as well)
here is my favorite example of astrology into play:
11/2000 (presidential elections)
Mercury in Retrograde in Scorpio~
Mercury = planet of communication, media, facts, etc.
Retrograde = planet appearing to move "backwards", but generally interpreted as "fowling" up the typical characters of the planet in retrograde
Scorpio = planet of power (more US presidents have been Scorpio then any other sun sign

)
so, with these typical characteristics, it is easy to see a "reflection" from the sky to the events occurring to earth, much like a mirror...
what i would like for all to remember is, astrology isn't a science, but a tool...