Using Intensity Interferometry to Measure the Geometric Distance of Cepheids
Jeter Hall, Fermi Lab.

We briefly discuss measurements of cepheid angular diameters which are used 
to calibrate the cosmic distance ladder on Galactic scales. We will touch on 
the primary source of error in traditional measurements, the atmospheric 
perturbation, and discuss the precision of an Intensity Interferometer for 
this type of measurement.