Tahir bin Jalaluddin

Sheikh Tahir Jalaluddin (8 December 1869, Ampek Angkek, Agam, West Sumatra – 1956) was a famous Muslim ulama in Southeast Asia. 
He became the editor for "Al-Imam" publication which was published in Singapore between 1906 and 1908.
Sheikh Muhammad Tahir published two major treatises on astronomy: "Natijatul'Umur" (published 1357 H./ 1936 M.) and "Kitab Jadual Pati Kiraan" (published in 1362 H./ 1941 M.) - logarithms for determining the direction of kiblat and times for prayer.
His son Tun Hamdan Sheikh Tahir was a Penang state governor "(Yang di-Pertua Negeri)" from 1989–2002.