PREFACE

In the present issue of the Handbook the list of stars occulted by the mo has been omitted, but any person who is able and willing to observe occultations will be supplied with the necessary information.

No star maps are included in the Handbook, but the following are recommended: Four circular maps, 9 inches in diameter, roughly for the four seasons, obtainable from the Director of University Extension, University of Toronto, for one cent each. A set of 12 circular maps, 5 inches, in diameter with brief explanation, is supplied by Popular Astronomy, Northfield, Minn., for 15 cents. Young’s Uranography, contains four maps with good descriptions of the constellations, suitable for small telescopes (Ginn and Co., 72 cents). Norton’s Star Atlas and Telescopic Handbook is larger and excellent. (Gall and Inglis, price 12s. 6d.; supplied also by Eastern Science Supply Co., Boston).

In the preparation of this Handbook the Editor has been assisted by Mr. H. Boyd Brydon, Victoria, who supplied much of the “copy” and read the proofs; Mr. W. E. Harper, M.A., of the Dominion Astrophysical Observatory, Victoria, B.C.; Dr. R. J. McDiarmid, of the Dominion Observatory, Ottawa; Mr. W. S. Armstrong, M.A.; and his colleague Dr. R. K. Young, of the University of Toronto.

The minima of Algol have been computed from an observation by Stebbins (Ap. J., vol. 53, 1921), J. D. 2422619.7866 with the period 2.86731077, given by Hellerick (A. N., vol. 209, p. 227, 1919).

Toronto, December, 1933.       The Editor.