The 13th day of the 4th month on the Tibetan lunar calendar is the anniversary of the rainbow body of Shardza Tashi Gyaltsen. Shardza Tashi Gyaltsen was a Yungdrung Bön monk, teacher, scholar and realized practitioner of the modern age. In 1934, he attained the rainbow body, Tibetan jalu, which is a sign of high realization in the practice of Dzogchen. Essentially, the practitioner has purified their karma and realized the ultimate state of mind such that at the moment of death, the five elements which construct the physical body dissolve into pure light rather than degrading. In this way, over the course of a few days, the physical body proportionally shrinks and, in some cases, completely disappears leaving only the hair and nails.
Throughout his life, Shardza Tashi Gyalstsen was known for stringent adherence to the many hundreds of vows that he had taken throughout his life. Additionally, he taught a multitude of disciples, organized the reconstruction of temples, went on pilgrimages, and spent a great deal of time in isolated meditational retreats. A prolific writer, he wrote volumes on the subjects of Bön history, instructions and guidance for the practice of Tibetan yoga, and detailed instructions for the advanced practice of inner heat, known as Tummo, among many other subjects.
In 1934 at the age of 76 during an offering ceremony, he began to spontaneously sing songs of realization. A few days later, he sewed himself inside of a tent and forbid any of his disciples to open the tent. The next day, rainbow lights began appearing above and around the tent. After 3 days, the ground shook. By the 4th day, rainbow-colored mist was seen coming through the seams of the tent. On that 4th day, Shardza’s disciple Tsultrim Wangchuk, afraid that his lama’s body would completely disappear and leave nothing for veneration, opened the tent. He found Shardza’s body enveloped in rainbow light, levitating in midair, and shrunken to the proportional size of a 1 year old. The area around the heart was still warm but most of the nails of the hands and feet had fallen onto Shardza’s seat below. For the next 49 days, disciples paid their respect. After that, the precious remains were placed into a reliquary chorten. From time to time, many people have reported seeing clear or rainbow-colored light emanating from this chorten