"Tahqiq-i-Hind" (also known as Kitab fi Tahqiq ma li'l-Hind min maqulah maqbula fi'l-ʿaql aw mardhulah, meaning 'Researches on India: From statements accessible to reason or to be rejected') is a famous book written by Al-Biruni. Al-Biruni (Abu Rayhan al-Biruni) was a Persian scholar who visited India in the early 11th century during the invasions of Mahmud of Ghazni. His book provides an extensive and objective account of Indian society, culture, religion, philosophy, science, and customs at the time, making it a valuable historical source.