But seven people stayed, they were so determined to learn from Shiva, that they sat still for 84 years. After this, on the day of summer solstice, when the sun was shifting from the northern to the southern run, Shiva took notice of these 7 beings - he could no longer ignore them. The next full moon, 28 days later, Shiva turned into the Adiguru (the first teacher), and transmitted the science of yoga to the Saptarishis