LOS ANGELES MEETING OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC

Abstract

annual summer meeting of the Astronomical Society of the Pacific was held in conjunction with the Pacific Division of the American Association for the Advancement of Science, June 18-22, 1951. Headquarters for the meeting was the University of Southern California, where all sessions for the presentation of contributed papers were held. itinerary of the participants, however, included the Griffith, Mount Wilson, and Palomar Observatories, and the California Institute of Technology. opening event of the meeting was a special planetarium demonstration, A Trip to the Moon, by Dr. Dinsmore Alter at the Griffith Observatory on Monday evening. space-travel projectors developed for this planetarium show have reached such a state of perfection that most of the audience felt, as they cruised 200 miles above the surface of the moon, that this mode of space travel had most of the advantages and none of the disadvantages of the real thing. following papers were presented and discussed at the Tuesday morning session, at which Dr. Otto Struve, president of the Society, presided : Apparent Velocities of Extragalactic Nebulae in Four Faint Clusters, Milton L. Humason Relation Between Radial Velocities and Colors in Clusters of Galaxies, Elizabeth L. Scott Galactic Orbits of Stars in the Vicinity of the Sun, R. J. Trumpler and H. F. Weaver The Diameter of Pluto, Dinsmore Alter, George W. Bunton, and Paul E. Roques Astronomy as an Avocational Outlet, Doncaster G. Humm Simultaneous Intensities of UpperAtmosphere Emission at Various Stations, F. E. Roach and Helen B. Pettit A Search for Micrometeorites in Puerto Rico, Victor M. Blanco