The Astronomical Society of the Pacific published a series of journals in the late 19th century dedicated to the study of astronomy. This book is a compilation of volumes 19-20 which include research papers, articles on astronomy-related topics, and astronomical observations made by members of the society. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Provides an outlet for current research in astronomy. Contains refereed research and instrumentation papers, invited reviews, and dissertation summaries.