Brian Keats produces two Astro Calendars on behalf of the Mathematics and Astronomy Section at the Goetheanum:
- Brian Keats (author), Astro Calendar 2015, North American Edition (Standard Pacific Time), Section for Mathematics and Astronomy at the Goetheanum (editor), Brian Keats Publishing, ISBN 978099240763-6, language: English
- Brian Keats (author), Astro Calendar 2015, East Asia Edition, (China Standard Time), Section for Mathematics and Astronomy at the Goetheanum (editor), Brian Keats Publishing, ISBN 978099240762-9, language: Traditional Mandarin and English
Please find more information at the web site www.astro-calendar.com.