TYKOCINSKI, JEHIEL MICHEL (1872–1955), rabbi and author. Tykocinski was born in Lyakhovichi, Belorussia. Orphaned of his father while still young, he was taken to Ereẓ Israel in 1882. He studied under Samuel *Salant, whose granddaughter
Tykocinski devoted himself especially to halakhic problems connected with astronomy, in which field he published Tekufat ha-Ḥamah u-Virkatah (1924); Bein ha-Shemashot (1929); and Sefer ha-Yomam (1943), on the international date line (see *Calendar). His other works are Tohorat Yisrael (c. 1910); Ha-Ishah al pi Ḥukkat Yisrael (1920); Hilkhot Shevi'it (1910) and Sefer ha-Shemittah on the laws of the Sabbatical Year; Gesher ha-Ḥayyim (1947, 19602) on the laws of mourning; and Sefer Ereẓ Yisrael (1955) on the laws and customs appertaining to Ereẓ Israel. He also published many articles in various journals and left behind in manuscript novellae on the Talmud and responsa.
J.M. Tykocinski, Gesher ha-Ḥayyim, 1 (19602), introd. by Nissan A. Tykocinski.