Tendo Dag

Tendo Dag (literally "Heavenly Day" or "Day of Heaven") is a term used within some interpretations of Japanese esoteric Buddhism, particularly Shingon Buddhism, to refer to auspicious days associated with the deities or celestial beings residing in the heavenly realms. These days are considered especially potent for performing certain rituals, making offerings, and undertaking spiritual practices believed to enhance one's connection with these deities and improve one's karmic fortune.

The specific days designated as Tendo Dag vary depending on the lineage, temple, or particular astrological and calendrical calculations used. The determination often involves complex systems related to the lunar calendar, astrological alignments, and the traditional Chinese zodiac.

The perceived benefits of observing Tendo Dag include increased efficacy of prayers, heightened spiritual awareness, and the accumulation of merit. Observances may involve special chanting practices (mantra recitation), the preparation and offering of specific food items (often vegetarian), and the performance of rituals (homa or goma fire rituals, for example) dedicated to the deities associated with that particular day.

The concept is related to, but distinct from, other auspicious days found in Japanese Buddhism and Shinto, which may be associated with particular deities, seasonal festivals, or historical events. Understanding the specific astrological and calendrical systems is crucial for correctly identifying and utilizing Tendo Dag for spiritual practice.