Consider first the obvious effect of the
Moon on water, which composes 50-80% of our bodies depending upon our age and some other factors. The auroras borealis and australis along with such phenomena as noctilucent clouds clearly demonstrate the physical effect of the solar wind on Earth's magnetosphere, and solar flares generate geomagnetic storms powerful enough to disrupt satellite-based services and even to blow up electrical transformers on the Earth's surface. It would be foolish to believe that these storms have no effect on organisms. We're bombarded constantly with gamma and x-rays, radio and light waves, neutrinos and other particles, and God-only-knows what else from all corners of the Universe as the matter and energy from cosmic events reach us, and the position of the Earth as well as our position on her at any given time subject us to some set of forces, always different from that of any moment before or since. That said, as much as anything
out there affects us, so to do we influence it.
Astrology serves to illustrate the active energies of times and places, the potentials of those energies to a given entity, the entity's likely reactions within them, both positive and negative, and the effects to ourselves and the wider world thereof.
The
Sun,
Moon, and
Ascendant are the basis of the three major
astrological influences. The planets and other bodies closest to us (within our own solar system) exert some influence upon us, but, as in the chart, to a lesser degree than those bodies which actively exude energy (the
Sun) or are situated closely enough with enough mass to have a measurable effect the (
Moon). The role of the
constellations in
astrology is that of providing reference for the manifestation of the energy of the celestial bodies given their position in the sky as their different positions cause their energy to affect us in different ways, demonstrated by the way light passing through the atmosphere changes color according to the Earth's position relative to the
Sun. The
astrological houses serve a similar purpose, serving to signify the areas of our lives in which an energy will have it's effect.