  Dirac materials, because of their small ${\cal O}(\mbox{meV})$ band gap, are
a promising target for dark photon-mediated scattering and absorption of light
dark matter. In this paper, we characterize the daily modulation rate of dark
matter interacting with a Dirac material due to anisotropies in their crystal
structure. We show that daily modulation is an ${\cal O}(1)$ fraction of the
total rate for dark matter scattering in the Dirac material ZrTe$_5$. When
present, the modulation is dominated by the orientation of the material's
dielectric tensor with respect to the dark matter wind, and is maximized when
the crystal is oriented such that the dark matter wind is completely aligned
with the largest and smallest components of the dielectric tensor at two
different times of the day. Because of the large modulation, any putative dark
matter scattering signal could be rapidly verified or ruled out by changing the
orientation of the crystal with respect to the wind and observing how the daily
modulation pattern changes.
