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This could distinguish a real signal from the unexplained excess of small events.","posed_since":"","precise":"For sub-GeV dark matter scattering via phonons or electrons in anisotropic crystals (e.g., $\\mathrm{Al_2O_3}$, hexagonal BN, graphene-like or Dirac materials), the rate $R(t)$ modulates with sidereal period because the dark matter wind direction rotates relative to the crystal axes; predicted fractional amplitudes reach tens of percent in some materials. The question is whether a modulation of this size can be measured at sub-eV thresholds with exposure below about $1\\,\\mathrm{kg}\\,\\mathrm{yr}$, given present low-energy excess rates, and whether the excess itself shows any sidereal modulation.","problem_ref":"45ca3224045fe4a750c1a11a5bfc843358f7b0115700613cf7f290e3e9ad1baa","references":"","settled_by":"A sidereal-period analysis of a low-threshold anisotropic-crystal data set with known orientation, giving an amplitude limit or detection at the predicted level.","status_note":"A 2026 preprint (arXiv 2606.04091) estimated halo-model uncertainties of 1-100 percent in single-phonon rates across the mass range, which enter the modulation prediction.","title":"Can daily modulation in anisotropic crystals identify light dark 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