  Spitzer microlensing parallax observations of OGLE-2015-BLG-1212 decisively
breaks a degeneracy between planetary and binary solutions that is somewhat
ambiguous when only ground-based data are considered. Only eight viable models
survive out of an initial set of 32 local minima in the parameter space. These
models clearly indicate that the lens is a stellar binary system possibly
located within the bulge of our Galaxy, ruling out the planetary alternative.
We argue that several types of discrete degeneracies can be broken via such
space-based parallax observations.
