Rav Yechiel Michel Tukatchinsky, mashgiach of Slabodka in Bnai Brak, and founder of Yeshivas Mekor Chaim in Yerushalayim. In 1925, he published a sefer called Tekufas Hachamoh Uvirchosoh, in preparation for the bracha made when the sun returns to the point at which it began upon Creation. He wrote a sefer called Bein Hashmoshos, published in 1929, which dealt with the International Date Line. In 1941, he changed his mind altogether, as documented in his sefer, Hayomam Bekadur Haaretz.
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Rav Yechiel Michel Tukatchinsky was never Mashgiach in Yeshivas Slobodka.
Rav Moishe Tikuchinsky who was not related to Rav Yechiel Michel Tukatchinsky (spelling of name different)
was Mashgiach in Yeshivas Slobodka.