Copepoda
an order of Crustacea, ranked under the subclass entomostraca and the legion lophyropoda. They are animals of small size, the body divided 00000 0000000 00 NICHOLAS COPERNICUS a canon in the cathedral of Frauenburg, and began to work out his new system of astronomy. Doubting that the motions of the heavenly bodies could be so complicated as the Ptolemaic system / COPLEY made them, he was induced to consider the simpler hypotheosis that the sun was the center round which the earth and the other planets revolve. Besides this funmany other of the principal facts of asmany other of the principal facts of astronomical science, such as the motion of the earth round its axis, the immense distance of the stars which made their apparent position the same from any part of the earth's orbit, etc. His general theory also enabled him to explain for the first time many of the important phenomena of nature, such as the varia- tions of the seasons and the precession of the equinoxes. The great work in which Copernicus explained his theory "On the Revolutions of the Celestial Orbs," was completed in 1530, and published at Nuremberg in 1543. He was excommunicated by the Pope on account of it. He died at Frauenburg, May 24, 1543.