Today, the 8th of Nissan, marks the Yahrtzeit of Rabbi Yechiel Michel Tukatchinsky, the Mashgiach of Slabodka in Bnai Brak, and the founder of Yeshivas Mekor Chaim in Yerushalayim.

He is also renowned for establishing the early zman on myzmanim.com for the earliest end of the fast day, and for his seforim such as Ir Hakodesh Vihamikdash, Bein Hashmoshos (regarding the international date line), and Gesher HaChaim (on Aveilus).