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):

• Observing Quasars for visual observing with a modest telescope
• Glossary
• Coloured Double Stars
• Dark Nebulae information, observation reports, charts, and images of each object.
• Finest NGC listed numerically
• Moonrise/moonset Correction Diagram for download.
• Sample observing form (As noted in the article The Observing Logbook)
• A full-colour version of the original b&w "The Black-Drop Effect during the Transit of Venus on June 8, 2004,” by Duval et al., JRASC 99, 170–176 (2005), for the ADS version, use tinyurl.com/5r8fln6
• Magnitude and Contrast Calculator (click to open)
• Noctilucent Clouds (click to open)
• Michael Boschat's primer on Radio Detection of Meteors
• An extended table of the Brightest Stars mentioned on p. 273 of the 2024  Handbook.
• An Eclipse History.
• Listing and map of lunar craters named for women
• Supernova Early Warning System (SNEWS)
• Starlink clutter
• Starlink Launch
• Astronomical League 2025
• Kemble's Fifty-to-the-Pole Program list