We report the detection of linear polarization from Sgr A* at 750, 850, 135
0, and 2000 mu m which confirms the contribution elf synchrotron radiation.
From the lack of polarization at longer wavelengths, it appears to arise i
n the millimeter/submillimeter excess. There are large position angle chang
es between the millimeter and submillimeter results, and these are discusse
d in terms of a polarized dust contribution in the submillimeter and variou
s synchrotron models. In the model that best explains the data, the synchro
tron radiation from the excess is self-absorbed in the millimeter region an
d becomes optically thin in the submillimeter. This implies that the excess
arises in an extremely compact source of similar to 2 Schwarzschild radii.