Designed to bring substantial, extensive support to the material found in the Journal, the Supplement Series contains many of the most frequently cited papers in astronomical literature.

"Letters to the Editor" issued as Part 2 and separately paged from v. 148, 1967. Beginning in 2009, the Letters published only online.

Selected by 50 notable astronomers from the major sub-fields of the discipline, the articles assembled in this special AAS Centennial collection are accompanied by commentary that provides the scientific-historical context essential to ...

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.

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.

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 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.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.