The role of the president pro tempore of the Senate is to. to be a leader of the Senate
to assign all joint committee members
to act as assistant to the party leader when needed
to act as a ceremonial role within the Senate

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.

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what are the options?