Domain
Wisdom, dharma, expansion. Guru is the most benefic graha — karaka of wisdom, dharma, children and expansion. Strong Guru is a major life asset.
Sacred day
Thursday. Activate the yantra at sunrise on this day for the strongest field.
Bija mantra
Om Gram Grim Graum Sah Gurave Namaha
Chant 108 times daily during the activation period (40 days minimum), and 27 times daily thereafter.
Recommended yantra
Gayatri Yantra Card — the traditional Bhagya Cards pairing for Guru (Jupiter).
When to invoke
If your kundali shows Guru (Jupiter) as a weak or afflicted graha, or if you are currently in its mahadasha or antardasha, the yantra is the standard upaaya. Combine with the bija mantra, a charity in the planet's name, and (for some grahas) fasting on the appropriate day.
Cross-references
See also: Yantras by zodiac sign · Navagraha — full glossary entry · All yantras.