Sun in Aquarius
The Sun in the sign Aquarius is a placement in a hostile sign: will through ideas, reform, and detachment. Aquarius is the eleventh sign of the zodiac, airy, fixed, ruled by Saturn — an adversary of the Sun in the traditional planetary friendships.
The Sun in Aquarius is uneasy here: the sign is ruled by an adversary of the Sun, and its bearer has to look for support outside the usual channels of self-assertion. This isn't debilitation — the Sun's only true sign of debilitation is Libra — but it isn't friendly ground either.
What this placement means
Aquarius under the rulership of Saturn gives two effects. The first is detachment: a person fits poorly into ready-made forms and often goes against the general current. The second is a reach of ideas: here the will shows up as a capacity to see what's far off and stretch toward it.
The Sun in Aquarius needs the freedom to build things its own way. A setting that demands it conform to a template smothers its very capacity to go its own way.
The Sun crosses a sign in about a month, and this is when the yearly highlight of the same channel of will falls: over that month, what's set by the placement in the chart is lived through. Lasting influences come through the slow planets' transits over this sign — Saturn crosses a sign in about 2.5 years, Jupiter in about a year — and through the mahadasha of Saturn as the sign's ruler. A transit of Rahu over the sign lasts about a year and a half and sets a separate layer of restructuring. The houses the Sun falls into in a chart, and the planets it's linked to by aspect, specify which spheres of life sharpen during these periods.
How it manifests
In character — through independence. A person with the Sun in Aquarius isn't inclined to hold on to authorities: their will rests on their own vision.
In behavior — through reform. Here the will shows up as a readiness to break what's outlived its time, even against the grain of habit.
In self-assertion — through the idea. The Sun in Aquarius proves itself by what it has brought that's new.
What to watch
The strength is the ability to see further and break the outdated. Where reform and an unconventional move are needed, the Sun in Aquarius works naturally.
The weak point is being cut off from its own: detachment from ready-made forms turns into difficulty being needed by someone specific, rather than merely right in general.