THE OBSERVER’S HANDBOOK for 1968 is the 60th edition. The table of contents has been replaced by an alphabetical listing. It is hoped that this will prove of greater usefulness. Certain changes among the miscellaneous astronomical data have been made in accord with the conversion of the Astronomical Ephemeris and American Ephemeris to the I.A.U. system of astronomical constants. The tenth satellite of Saturn has been added to the table of satellites of the solar system. The times of sunrise and sunset, and of twilight, are again the values for the current year.