  Cooling of systems to sub-kelvin temperatures is usually done using either a
cold bath of particles or spontaneous photon scattering from a laser field; in
either case, cooling is driven by interaction with a well-ordered, cold (i.e.
low entropy) system. However, there have recently been several schemes proposed
for ``cooling by heating,'' in which raising the temperature of some mode
drives the cooling of the desired system faster. We discuss how to cool a
trapped ion to its motional ground state using unfiltered sunlight at
$5800\,\mathrm{K}$ to drive the cooling. We show how to treat the statistics of
thermal light in a single-mode fiber for delivery to the ion, and show
experimentally how the black-body spectrum is strongly modified by being
embedded in quasi-one-dimension. Quantitative estimates for the achievable
cooling rate with our measured fiber-coupled, low-dimensional sunlight show
promise for demonstrating this implementation of cooling by heating.
