Observer's Handbook Supplements

117th Edition, Edited by James S. Edgar

This is the supplements page for the Observer’s Handbook 2025, one of Canada's oldest scientific publications. This page lists resources related to the Handbook; the following supplements are available (these are the property of the RASC; copying is forbidden without express written consent):

The Observer’s Handbook contains a number of recommended links to additional astronomy resources. This page includes live hyperlinks that will allow you to access these resources more easily. Happy exploring!

• Access the websites listed in Selected Internet Resources on page 15 of the 2025 Observer’s Handbook.
• Access all the websites listed in the 2025 Observer’s Handbook, listed by page.

Handbook Updates

Every effort is made to ensure that the RASC Observers's Handbook is as accurate and comprehensive as possible. Occasionally, errors or omissions can occur and readers will find updated information on these pages.

If you have identified an error and want to let us know, then please forward a message to the Handbook Editor.

For 2025, the following individuals have donated their time and expertise to contribute sections or material:

James S. Edgar, Editor, Melville, Saskatchewan

Dr. Roy Bishop, Editorial Consultant and Proofreader, Halifax, Nova Scotia

Michael Gatto, Graphics Consultant, Avonport, Nova Scotia

Betty Robinson, Copy Editor. Mississauga, Ontario

by Nicole Mortillaro, Editor-in-Chief, the Journal

Nicole Mortillaro, Editor-in-Chief

114th year of publication

• Mr. Bruce A. Aikenhead*
• Mr. Terence Dickinson*
• Dr. Alice Vibert Douglas*
• Dr. Helen Sawyer Hogg*
• Dr. Heinz Lehmann*
• Dr. Paul Marmet*
• Dr. Jaymie Matthews
• Dr. P.J.E. Peebles
• Dr. Sara Seager
• Dr. Gordon Shrum*
• Dr. William Thomas Tutte*