What's actually happening
Jupiter completes a full circuit of the zodiac in about 12 years, spending roughly 12 months in each sign. Leo is a fixed fire sign ruled by the Sun.
What the tradition makes of it
Jupiter in Leo is one of the more celebrated transit combinations in classical and modern tradition alike. The planet of abundance and vision in the sign of confident self-expression tends to produce a general atmosphere of creative generosity — the willingness to give what has been cultivated, to be seen in one's full capacity, to invest in the work of those around you as well as your own.
The tradition notes that this transit amplifies visibility. What is done under Jupiter in Leo tends to be done larger and more publicly than usual. The recognition that follows can be genuine and deserved — or it can be the recognition of performance rather than substance.
The shadow is grandiosity in the literal sense: the inflation of the individual ego to the point where it confuses itself with something universal. The warmth of Leo, amplified by Jupiter, becomes the conviction that the sun revolves around this particular person.
How to actually use it
Create and share. This is good weather for the work that needs to be seen — for the book that is finally published, the project launched, the performance given with full commitment. Let the generosity outpace the ego.
The practice is to receive feedback as information rather than as tribute.
When in doubt
What would you create if the point were to give it rather than to keep it?