Jupiter's twelve-year circuit
Jupiter transits about one sign per year, completing the zodiac in roughly twelve. Each year it occupies a new house from the natal Moon, moving its blessing steadily around the chart. Finding which house it is in this year is the first step of any Jupiter forecast — count its transit sign from the Moon.
Over twelve years Jupiter visits every house from the Moon in turn.
The count
Seat plus three beams: H, H+4, H+6, H+8
Jupiter lights the house it sits in AND the houses it aspects by its 5th, 7th, and 9th drishti — four houses at once. The shortcut: if its seat is the Hth house from the Moon, its beams fall on H+4, H+6, and H+8 (wrapping past 12). So a quiet seat can still throw a beam onto the year's most important matter.
Jupiter in the 3rd from the Moon (H=3) lights 3, 7, 9, 11 — its aspects reach partnership, fortune, and gains.
Worked example
A Virgo Moon, Jupiter in Gemini
Natal Moon in Virgo. Put Jupiter in Gemini and count: Virgo 1 to Gemini is the 10th from the Moon, so H=10. The beams land on H+4, H+6, H+8 — the 2nd, 4th, and 6th. Check it by sign: Jupiter's 5th/7th/9th from Gemini are Libra, Sagittarius, Aquarius, which are the 2nd, 4th, 6th from a Virgo Moon. Four lit houses: the 2nd, 4th, 6th, and 10th.
Seat 10th, beams 2nd/4th/6th — the count and the sign-by-sign check agree.
Where growth classically opens
Jupiter is favorable in the 2nd, 5th, 7th, 9th, and 11th from the Moon (n80). When its seat OR one of its beams reaches the 5th (children, creativity), 7th (partnership, marriage), 9th (fortune, dharma), 2nd (wealth), or 11th (gains), that matter expands and becomes available for the year.
Jupiter transiting or aspecting the natal 7th is a hallmark marriage-opportunity window.
Opportunity, not delivery
Jupiter opens a door; it does not push anyone through. When it transits the 1st from the Moon (over the natal Moon), the year buoys the mind toward optimism and confidence — with a shadow of complacency, a good feeling that can excuse coasting. Jupiter expands whatever it finds: effort into achievement, ease into comfort. Read it as availability, and act.
A Jupiter-over-Moon year feels hopeful; whether it builds depends on what the person does with it.
A milestone every twelve years
Every ~12 years Jupiter returns to its natal sign — the Jupiter return, at roughly ages 12, 24, 36, 48, and on. Each opens a new growth cycle, a natural chapter boundary in the life's expansion. The return near 24 often coincides with a life's real launch; read the return year as a threshold worth naming.
The first adult Jupiter return near age 24 frequently marks a genuine beginning.
The one idea to keep
Follow the four beams, year by year
Jupiter's transit is a rolling opportunity map: a year per sign, lighting its seat (H) and its beams (H+4, H+6, H+8) from the Moon, opening the classic growth windows, cycling back every twelve years. Count the four houses — then remember the door still needs opening.