First ground-based definitive detection of the faint photospheric Si I 6560.57 Å line within the Hα band. Top panel: full spectrum from 6560 to 6565 Å, overplotted with telluric H₂O lines from the HITRAN database. Bottom panel: detailed profiles at the solar disk center, east limb, and west limb, showing the Doppler-shifted Si I line relative to stationary telluric features. The dotted lines are from the observations, and the solid lines are the Si I 6560.57 Å spectral profiles from the west limb, disk center, and east limb extracted from the observations.