Word: orbits
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Dates: during 1930-1939
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...search was begun by Harvard astronomers for old photographic plates which may contain pictures of the new planet. If these are discovered additional material will be available from which may be calculated the precise position of X and its orbit...
...orbit of the Wilkes comet has been computed, it was announced yesterday by Harlow Shapley, director of the Harvard College Observatory. "The comet," Professor Shapley stated, "has been observed in Copenhagen. Berlin, and at the Mt. Hamilton Observatory of the University of California in Berkeley. This latter station has forwarded its calculations to us for redistribution...
...great gravities of the planets affect each other as they circle around the Sun and make their orbits slightly irregular. It was man's mathematical ability to measure such orbital variations that permitted Astronomer Lowell to declare that an unknown planet was butting Neptune's orbit out of its regularly irregular shape and to predict just where in the heavens a sufficiently powerful telescope, which did not exist during his life, would reveal...
...Observatory has always devoted its of largely to that planet, and the planetary system. Astronomers have long known from the irregularities in the motions of the farthest planets that another existed still farther off. Some years before his death Lowell made some calculations to discover the position and the orbit of that planet, which were published in the proceedings of the American Academy of Arts and Sciences in 1915. Since that time his observatory at Flag-staff has been seeking it in the sky. Seven weeks ago a small object was observed, but it was not until yesterday, after seven...