The Handbook for 1953 is the 45th issue and its circulation is 5000. The Officers of the Society appreciate the increase in advertisements which will help to meet our mounting expense. With regret the price has been raised to 50 cents. In this issue the tables for sunrise, sunset, twilight, moonrise and moonset are given for latitude 54° N. instead of 52° N. The range now covers the latitudes of all the centres.
The Handbook for 1952 is the 44th issue. Its present circulation is 5000 which we hope will be materially increased in order to meet our mounting expense.
In recent years Dr. F. S. Hogg, who was Assistant Editor, assumed the responsibility of preparing the volume; and his death on the first day of 1951 was a great loss to the Royal Astronomical Society of Canada as well as to the world of Astronomy in general.
The Handbook for 1951 is the 43rd issue. During the past decade its circulation has increased from 1500 to 5500.
Four circular star maps 9 inches in diameter a t a price of one cent each, and a set of four maps plotted on equatorial co-ordinates a t a price of ten cents, are obtainable from the Director of University Extension, University of Toronto Toronto 5.
Celestial distances given herein are based on the standard value of 8".80 for the sun’s parallax, not on the more recent value 8".790 determined by Sir Harold Jones. Among the recent additions are:
The Handbook for 1950 is the 42nd issue. During the past decade its circulation has increased from 1500 to 5500. This year, for the third time, some advertisements of astronomical accessories are inserted. The Officers of the Society appreciate this assistance a t the present time of financial difficulty. Four circular star maps 9 inches in diameter a t a price of one cent each, and a set of four maps plotted on equatorial co-ordinates a t a price of ten cents, are obtainable from the Director of University Extension, University of Toronto, Toronto 5.
The Handbook for 1914 differs from that for last year chiefly in the addition of the phenomena of Jupiter’s Satellites (page 46), though some other additions and corrections have been made which, it is hoped, will render the work more useful. As in previous years the Editor is indebted to those whose names appear in the body of the book, and also especially to Mr. R. M. Stewart, M.A., of the Dominion Astronomical Observatory, Ottawa, who prepared the “ Astronomical Phenomena” on the odd pages from 23 to 45, and the “ Phenomena of Jupiter’s Satellites.”
The Handbook for 1943 is the thirty-fifth issue. The times of moonrise and moonset, first printed last year, are now extended to include five latitudes, namely, 40, 45, 50, 52 and 54 degrees. The page of meteorological information for places in Europe and Asia is not given this year; but the tables of lunar occultations for Canadian stations appear again. Messier’s catalogue has been replaced by three tables giving more complete information about clusters, galactic nebulae, and extra-galactic nebulae.
The Handbook for 1942 is the thirty-fourth issue. Its chief changes from that of last year a re : (1) On pages 17 to 23 the times of moonrise and moonset are given for each day of the year for four latitudes. This information has been prepared in response to a request from instructors in the Air Force; (2) A table of meteorological information for stations in Europe and Asia is given on page 3 of the cover.
The Handbook for 1941, which is the thirty-third issue, is arranged similarly to that of last year. The chief changes are: (1) The ephemerides of the bright asteroids have been omitted; (2) A list of stars used in air navigation has been added.
The Handbook for 1940, which is the thirty-second issue, is arranged similarly to that of last year. The chief changes are: (1) The table of constellations has been re-set, giving the English as well as the Latin names; (2) The table of brightest stars has been completely revised by Dr. Harper and includes the latest available information; (3) An account of the transit of Mercury in 1940 is given.
In the Handbook for 1939, which is the thirty-first issue, numerous changes have been made. By giving the times of sunrise and sunset for every second day, although additional latitudes have been included, there has been a saving of six pages of space. This has allowed the inclusion of times of beginning and ending of twilight, of ephemerides of Saturn’s satellites and of the brighter asteroids, the extension of information on Meteors and Occultations, and the insertion of a table of miscellaneous Astronomical Data. The table of Satellites has also been revised.