Guru Maneyo Granth Gurdas) The event in 1708 at Nanded (in present-day Maharashtra), when Guru Gobind Singh installed Adi Granth as the Guru of Sikhism, was recorded in a "Bhatt Vahi" (a bard's scroll) by an eyewitness, Narbud Singh, and is now celebrated as Gurgaddi (Guru Gaddi Divas), and statement is part of the central chant, "Sabh Sikhan ko Hukam Hai, Guru Maneyo Granth". October 2008 marked the Tercentenary year of Guruship of Guru Granth Sahib and was marked by major celebrations by Sikhs worldwide, and especially at Takht Sri Hazur Sahib, Nanded saw year-long celebrations. The composition of the sacred Granth contains
Adi Shankara ("Bhāṣya"), original philosophical expositions ("Prakaraṇa grantha") and poetry ("Stotra"). However most of these are not authentic works of Adi Shankara and are likely to be works of his admirers or scholars whose name was also Shankaracharya. Piantelli has published a complete list of works attributed to Adi Sankara, along with issues of authenticity for most. Adi Shankara is most known for his systematic reviews and commentaries ("Bhasyas") on ancient Indian texts. Shankara's masterpiece of commentary is the "Brahmasutrabhasya" (literally, commentary on Brahma Sutra), a fundamental text of the Vedanta school of Hinduism. His commentaries on ten Mukhya (principal) Upanishads are