Originally published in 1906. This volume from the Cornell University Library's print collections was scanned on an APT BookScan and converted to JPG 2000 format by Kirtas Technologies. All titles scanned cover to cover and pages may include marks notations and other marginalia present in the original volume. Contents Ch. 1: Introductory Ch. 2: Differences, Interpolation, and Development Ch. 3: The Method of Least Squares Ch. 4: Spherical Coordinates Ch. 5: The Measure of Time and Related Problems Ch. 6: Parallax and Related Subjects Ch. 7: Aberration Ch. 8: Astronautical Refraction Ch. 9: Presession and Nutation Ch. 10: Reduction of Mean Places of the Fixed Stars from One Epoch to Another Ch. 11: Reduction to Apparent Place Ch. 12: Method of Determining the Positions of Stars by Meridian Observations Ch. 13: Methods of Deriving the Positions and Proper Motions of the Stars from Published Results of Observations