Extensive high sensitivity observations of the cosmic microwave background have been made on an angular scale of 8° covering a substantial fraction of the northern sky. An observed anisotropy in the sky emission at a level of ΔT/T = 3.7×10-5 has been detected (T is temperature). This level should strictly be interpreted as an upper limit to the

IAUC 4368 available at Central Bureau for Astronomical Telegrams. IAUC 4368 available at Central Bureau for Astronomical Telegrams.

Not Available

The present examination of general relativistic effect on the lag time between continuum and emission line variations in the broad line notes that in the case where the primary source region lies within the range of a strong gravitational field, simultaneity surfaces in the ionized gas are different from those obtained without accounting for the

This atlas shows the locations of and gives information about optical telescopes used for astronomical research in the United States as of late 1986. Those instruments with mirror or lens diameters of 3/4 m (approx. 30 inches) and larger are included. These telescopes are concentrated in the Southwest, on the West Coast and on the island of Hawaii.

A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature spots results from the subphotospherically controlled attraction of several large fragments of 1-2 x 10 to the 21st Mx, which are themselves made of smaller elements. The fragments are more