March 13, 1930

1930Walter Jacob, American Reform rabbi (died 2024)^[†]

Walter Jacob was an American Reform rabbi. He was rabbi at the Rodef Shalom Congregation in Pittsburgh from 1955 to 1997. He served as chairman of organizations such as the Central Conference of American Rabbis and World Union for Progressive Judaism. Jacob wrote a book, Christianity Through Jewish Eyes in 1974, leading to interfaith dialogue. He founded the Solomon B. Freehof Institute for Progressive Halakhah in 1991, an international forum for Jewish law. In Germany, he co-founded the Abraham Geiger College, the first rabbinic seminary in Central Europe since the Holocaust, in 1999.

1930The news of the discovery of Pluto is announced by Lowell Observatory.^[†]

Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume by a small margin, but is less massive than Eris. Like other Kuiper belt objects, Pluto is made primarily of ice and rock and is much smaller than the inner planets. Pluto has roughly one-sixth the mass of the Moon and one-third of its volume. Originally considered a planet, its classification was changed when astronomers adopted a new definition of planet.