Each planet has a home on the birth chart (i.e. being born with Mercury in the Ninth House). A planetary transit would occur the following hour as Mercury moved into the Eighth House. When a planet returns to the house it occupies in a birth chart, expect to recognize the planet’s expression (not dissimilar to a first impression). For example, a child experiencing a pet at home versus through a classroom would likely possess different petcare frameworks. Compared to the latter child, the former could have a different perspective on bringing pets to work.
First House Sun prefers to be openly expressed.
Second House Sun prefers to not draw attention.
Third House Sun prefers to play with self-expression.
Fourth House Sun prefers being in community.
Fifth House Sun is comfortable with attention.
Sixth House Sun prefers to go unnoticed.
Seventh House Sun prefers a constant flow of attention.
Eighth House Sun prefers close relationships.
Ninth House Sun prefers being anonymous.
Tenth House Sun prefers being the leader.
Eleventh House Sun prefers positions of power.
Twelfth House Sun prefers blending with a crowd.
(Leo rules the Sun and the Fifth House rules Leo. The Sun is domiciled in the Fifth House meaning the planet expresses itself comfortably, lacking any sort of preference.)