Andrew Dumbleton Profile Topics Started Replies Created Engagements Favourites Search topics: Topics Engaged In Viewing topic 1 (of 1 total) Topic Voices Posts Last Post Planisphere for demonstrating precession of the equinoxes Started by: Dominic Ford in: Computing 6 10 5 years, 7 months ago Robert Ian Henderson Viewing topic 1 (of 1 total)