Virgo
What is already familiar, instinctive, and ready to be carried forward.
Libra
What is arriving, stretching the old shape, and asking for a new response.
A cusp is best understood as a threshold image: Virgo's earth mutable quality meets Libra's air cardinal quality. The Sun is still in one sign at a time, while the neighboring symbolism can describe the season around it.
Virgo brings
Virgo is ruled by Mercury and speaks through earth mutable movement. Its familiar lesson is about the craftsman.
Libra arrives
Libra is ruled by Venus and changes the texture toward air cardinal expression. Its invitation is to practice the mediator.
A boundary, not a loophole
If you were born near a sign boundary, use an accurate birth time and place when a precise chart matters. The cusp language can be a useful metaphor, but it should not replace the actual Sun sign.