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 in 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 Huiracocha with related practices and prayers; as well as articles from the ""Revista Rosa Cruz"" on relevant topics.