Observations of interstellar Na I in the spectra of 93 stars within 315 pc from the Sun show that it lies in a tunnel of gas moving away from Scorpio-Centaurus and is surrounded by gas moving toward the Galactic center. Gas approaches the Sun from Scorpio-Centaurus expanding from (r,l,b) = (160 pc, 313^circ7, +28^circ2) with LSR velocity 15.3 km s^

Apart from the solar core, the overshoot layer below the convective zone is the layer where some discrepancies between the standard and seismic solar models continue to exist. Non-local mixing length models are in clear conflict with the seismic evidence. A major difficulty for the development of more sophisticated models is the large degree of

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