We examine the prospects of making a joint analysis of neutrino oscillation at two baselines with neutrino superbeams. Assuming narrow band superbeams and a 100 kt water Cerenkov calorimeter, we calculate the event rates and sensitivities to the matter effect, the signs of the neutrino mass differences, the CP phase and the mixing angle θ13. Taking into account all possible experimental errors ...

We investigate the issue of whether an optical interferometer with baselines long enough to resolve details of a geostationary satellite can be phase stabilized. We conclude that it is possible to phase such an interferometer with shorter baselines using the techniques of baseline and wavelength bootstrapping, and that these shorter baselines are not so short as to make the instrument impractic...

At the milliarcsecond scale, most of the extragalactic radio sources exhibit spatially-extended intrinsic structures which are variable in both time and frequency. Such radio structures set limits on the accuracy of source positions determined with the Very Long Baseline Interferometry (VLBI) technique unless their e ects in the astrometric data can be accounted for. We review the modeling sche...