Researches on the Motion of the Moon, made at the United States Naval Observatory Washington


    THE author prefaces his work with the remark that for several years after the publication of Hansen's Tables of the Moon, there was a very general belief that the motion of our satellite could be followed by their means with the same accuracy as that of the other heavenly bodies, after having been made the subject of astronomical and mathematical research for two thousand years. This expectation was soon proved to be far from borne out. Prof. Newcomb showed in 1870 that the accuracy of the Tables since 1750 had been secured only by sacrificing the agreement with observations previous to that epoch, and that about 1700 the Tables deviated more widely from the observations than the previous ones; and it may be added that those who had been engaged in examining the old eclipses were aware that Hansen's Tables did not represent the phenomena only as far back as the commencement of the eighteenth century, so well as Burckhardt's or Damoiseau's, which had been used for our ephemerides up to the date of their publication.

    Researches on the Motion of the Moon, made at the United States Naval Observatory. Washington.

    By Simon Newcomb, Professor U.S. Navy. Part I. (Washington, 1878.)

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