Did you ever wonder about some things in Sailor Moon? Like, why Jupiter is an Inner Senshi if the planer is considered part of the outer solar system? You've come to the right place! We can answer those questions! Well, at least some of those questions... :) The more research I do, the more of these little facts I find, as I find more I'll post them here.

-Jupiter is considered an inner planet in astrology since it moves quickly enough to affect a natal chart. For the most part, the astrological outer planets are considered generational, since they move much slower than the inner astrological planets.

-Mars and Venus relate closely astrologically. If you notice, in many manga pictures Rei and Minako are together a lot, whether they're holding hands, leaning on each other, etc...

-Although in mythology Pluto represents death and Saturn time, in astrology it's the reverse - Pluto represents time and Saturn death and destruction.

-To quell a rumor I've seen on the 'net: Uranus does not represent homosexuality in astrology. The closest I've found in my research is that if Aquarius (the sign Uranus rules) is badly aspected, it can represent "sexual perversity." While I don't regard homosexuality as perversion some people might (which is stupid), so maybe that's how this rumor was started. Aquarius/Uranus can be considered a male aspect, though, and Pisces/Neptune a female aspect, so that may have played into Sailors Neptune and Uranus's personalities.

-Here's somewhere that Naoko seems to veer away from astrology somewhat. There are two symbols for the planet Pluto. The astronomical one-the one that looks like a P and an L combined-is the one that's used for Sailor Pluto. But this:

is commonly used in astrology to represent the planet Pluto. The astrological one is so much nicer looking, I think, I've always wondered why it wasn't used. Though recently, it was pointed out to me that Pluto's time staff looks like the astrological symbol... hmmm...

The Senshi fuku colors also seem to be astrologically-based. According to Linda Goodman, the colors are:
Aries: Fire red
Cancer: This is a quote from Sun Signs: "...she wears pale gold and the shimmering colors of moonlight." Neat, huh? ^_^
Virgo: White and navy blue
Libra: Copper
Scorpio: Dark maroon or deep wine-red
Sagittarius: hmmm, I couldn't find a color for Sagittarius, but I know it's in here somewhere...I'll find it...
Capricorn: Jet black
Aquarius: Sapphire blue
Pisces: Aquamarine