The Siddhanta Kaumudi is a critical and scholarly commentary on the Sutras of Panini by Bhattoji Diksita, a stalwart grammarian of the Panini system who flourishes in the first half of 17th century. the work is exhaustive, yet not voluminous, difficult yet popular, and critical yet lucid. The work is next in importance to the Mahabhasya in the system of Panini and its study prepares the way to the Mahabhyasya.