Large-scale anisotropy in the 2. 7 K radiation

We report the results of two baloon flights, covering half the sky, to measure the large-scale anisotropy of the 2.7 K cosmic radiation. Radiometers at three wavelengths give results which are well fitted by a dipole distribution with amplitude 2.99 +- 0.34 mK and direction R. A.=12./sup h/.3 +- 0/sup h/.4 and decl. =-1/sup 0/ +- 6/sup 0/. An upper limit of 2 mK (95% confidence) is found for the amplitudes of nonpolar components of a quadrupole distribution.