September 19th marks the 10th day of the lunar calendar when the male energy of skillful means is most prevalent.
This day is also the anniversary of Guru Nyima Ozer, one of Guru Rinpoche's manifestations. On the 10th day of the month of the Pig, Guru Rinpoche transformed the poison concocted by the Tirthikas into nectar. His healthy radiance transformed the mind of the Tirthikas and converted them and their retinues to the Dharma. He became known as Guru Nyima Ozer or Suryaprabha, the Guru who is like rays of the sun.