Nice question!
The most important thing is that planets are always located next to similar planets, so the Jupiter is accompanied by Neptune (they both indicate expansion) both in Pisces and Sagittarius, or by Venus in Taurus. It always takes feminine qualities of expansion.
All the others planets act alike, remember we have just 2 directly sexual planets, Mars and Venus, which are never together. All the other planets have a nature that must join with similar elements.
Jupiter in Pisces, despite having its common features of expansion, is principally indicating luck. You might laugh at this explanation, Pisces don't seem so lucky and they have a habit to complain about most things, but let's not forget that Pisces is the last sign of the zodiacal wheel, the sign that has to face the unknown and has to deal with the potent energies of Neptune, that make them so "out of this world" most of the times, Jupiter here acts like a protection, Pisces won't get totally lost in the end because of Jupiter.
Right! Pisces is TOO amorphous and expansive! Jupiter lays down some ground rules to keep Pisces in line. Very annoying, but necessary.
This thread discussion is on the topic of why Jupiter rules PiscesI have Jupiter in pisces 3rd house... but it's retrograde.
It also sextiles my ascendant.
Would this still be considered "lucky"? Even with retrograde and 3rd house?
SiriuslyJupiter doesn't rule Pisces! It is exalted there, but it doesn't rule.
Neptune rules Pisces!
Seriously those old astrologers had no clue
because Uranus, Neptune and Pluto werent discovered yet.
Siriusly
Modern Astrological Essential Dignity/Debility is strongly reliant
on the original Traditional Essential Dignity/Debility Tables
and few
if any
Modernist astrologers
assign rulership of any sign SOLELY to any outer planet
instead
CO-RULERSHIP is assigned by Modernists
FURTHERMORE
Jupiter is Exalted in Cancer
HOW TO READ THIS TABLE OF DIGNITIES AND DEBILITIES
http://www.skyscript.co.uk/dig2.html
Originally Posted by dr. farr
I believe that the long established (Western) dignity/detriment model
was developed upon the framework of 12 signs and 7 planets
and that this model works perfectly well
within the context of the Hellenist and Traditionalist whole system models.
I also question the practicality
of attempting to fit other cosmic factors (the outer planets)
into that specific model.
However, concepts such as dispositorship-like influences, elemental qualities, etc
can be applied to these other cosmic factors (the outer planets),
although upon an experimental basis
(until several hundred years of such uses,
and the collection of results from such uses, have been accumulated)...
But Jupiter is much more like Sagittarius; more concerned with religion in the traditional sense, and occupied with morals, rules, laws, etc, whereas Pisces is more spiritual, a little more mumbo-jumbo so to speak. And the innate sensitivity, sacrifice, confusion and martyrdom that is so much associated with Pisces goes hand in hand with Neptune. Neptune is so obviously ruling Pisces, and Uranus Aquarius. It is so obvious to me I can even see it in their appearances.
Significations of Jupiter are as followsBut Jupiter is much more like Sagittarius; more concerned with religion in the traditional sense and occupied with morals, rules, laws, etc, whereas Pisces is more spiritual, a little more mumbo-jumbo so to speak. And the innate sensitivity, sacrifice, confusion and martyrdom that is so much associated with Pisces goes hand in hand with Neptune. Neptune is so obviously ruling Pisces, and Uranus Aquarius. It is so obvious to me I can even see it in their appearances.
There are serious doubts concerning Ptolemy's rationale, and it's generally believed that the origins of rulership assignments predate his own explanation. So, it's a legitimate question, not only for Jupiter, but for ALL rulerships.
It must be more complicated then it seems...
Both Sagittarius and Pisces looks beyond, and Jupiter expands so it fits.
It is based on an astrological geometry, so to speak, as per the two attachments. Jup rules Sag and Pi, well, just because it does. Not because of modern symbolism that you might be looking for. Jup's rulership of Pisces is way older than modern astrology, so cannot be explained or defended using modern astrology.
Check out the images and see that there is just a pairing of signs to each traditional planet, with the exception of Sun and Moon.
Notice that the rulers that move in only one direction rule one Sign each whereas those that move in two directions (Dir.& Retro.) rule two each. Also, the Heliocentric model was well-known by 150 B.C.E., and COULD have been used as a cipher in assigning rulerships--what stands out immediately is the Heliocentric, stationary (& fiery) Sun given rulership of Fixed Fire. There's more, but the point is, the neat geometric mandalas you posted may have been only part of the reason for the Traditional, 7-pattern rulerships.