THE OBSERVER’S HANDBOOK for 1963 is the 55th issue. The tables of the principal elements of the solar system and of the satellites have been revised to give the accepted values used in the national ephemerides; the inclination of the equator of each planet to its orbital plane has been added. Dimensions of Saturn’s rings are included. The predictions for the minima of Algol are based on the period and epoch used previously; from recent observations, these may be of the order of three quarters of an hour late.
THE OBSERVER’S HANDBOOK for 1962 is the 54th issue. The section on lunar occultations has been expanded to include all the predictions made for the Canadian Stations by the British Nautical Almanac Office; occultations of stars of magnitude 7.5 or brighter are listed. Comments are requested concerning the increased value of this enlarged section.
THE OBSERVER’S HANDBOOK for 1961 is the 53rd issue. Several additions have been made: the pronunciations of the names of the constellations, a finding list of named stars, a small map of the moon and the maximum and minimum values of the moon’s libration in longitude and latitude. Additional explanations are given for sidereal time and for the correction for longitude in changing from local mean to standard time. Opposition ephemerides are given for the four brightest asteroids, together with a map of the path of Vesta near the time of opposition.
THE OBSERVER’S HANDBOOK for 1960 is the 52nd issue. Two additions have been made: the range of change during the year of the longitude of the moon’s orbit and opposition ephemerides of the two brightest asteroids. Certain of the miscellaneous astronomical data and the section on time have been revised. The section on occultations has been extended to include stars of magnitude 5.3 or brighter.
The OBSERVER’S HANDBOOK for 1959 is the 51st issue. Three additions have been made: daily values of the sun’s selenographic colongitude, planetary appulses and occultations, and a table of the nearest stars.
The Observer’s Handbook for 1957 is the 49th and largest yet published. Interest in astronomy has increased steadily in the last ten years: the current impetus of the International Geophysical Year is coupled with that of rapid and incredible developments in many fields related to astronomy. The advances being made daily in radio astronomy, missiles research and the proposed launching of man-made satellites have led the intelligent layman to feel the need for a greater knowledge of the fundamentals of astronomy.