This is the first known English translation of a profound book of Esoteric Knowledge. It is presented in a Bilingual format (English side by side with the original Spanish) with copious footnotes. This was the first of a series of correspondence courses sent to the subscribers of the "Revista Rosa Cruz" between 1929-1931. "All the works of the renowned Krumm-Heller (Huiracocha) are wells of initiatic wisdom that very few have comprehended...The most profound Initiatic Wisdom of the centuries is enclosed in Huiracocha's "Zodiacal Course"." - from 'GEMINI' in the "Zodiacal Course" by Samael Aun Weor This books has 2 main sections: 1) "Zodical Course" by Krumm-Heller (Huiracocha) 2) Editor's Appendix with extracts from Lectures by Samael Aun Weor which mention Krumm-Heller (Huiracocha) and his techniques for spiritual development; extracts from the "Magic of Silence" by Krumm-Heller with related practices and prayers; as well as articles from Krumm-Heller's 'Rose Cross Magazine' on relevant topics.