Skip to content
British Astronomical Association
Supporting amateur astronomers since 1890
Community
Community
Observer’s Challenges
Tutorials
Dark Skies Commission
BAA Alerts
Observing Calendar
Forum
Archives
Affiliated Societies
Outreach
Useful Links
News
Latest News
BAA Business
Sky Notes
Events
Events
Future Events
Previous Events
Publications
Journal
Book Reviews
Documents
Latest Documents
Handbooks
Buy
Sections
All Sections
Asteroids & Remote Planets
Aurora & NLC
Comet
Computing
Dark Skies
Deep Sky
Education & Outreach
Equipment & Techniques
Exoplanets
Historical
Jupiter
Lunar
Mars
Mercury and Venus
Meteor
Radio Astronomy
Saturn, Uranus & Neptune
Solar
Variable Stars
Videos
Videos
Meetings
Dark Skies
Deep Space
Deep Sky
Exoplanets
Variable Stars
Hardware
Equipment
Radio Astronomy
Robotic Exploration
Solar System
Asteroids
Comets
Jupiter
Mercury & Venus
Outer Planets
The Sun
Terrestrial
Aurorae
Historical
Meteors
The Moon
Observations
Gallery
Spectroscopy database
Photometry database
Comet Section Archive
Solar Section Archive
Observing Calendar
About Us
About us
Join
Contact Us
Grants
Who’s Who
Awards
Shop
Donate
Privacy Notice
Terms of Use
Dark Skies Commission
Login
Login
Renew membership
Join the BAA
spm_1_1_6
Documents
1956 Mar 23 spm 1 1 6
