In 1802 he was appointed editor of the Gentlemen's Diary, and in 1818 editor of the Ladies' Diary and superintendent of the almanacs of the Stationers' Company.
Year-books, almanacs, directories and other annuals belong to a distinct type of publication, and are not referred to here.
Years " of the Rat," "of the Tiger," " of the Pig," still figure in the almanacs of Central Asia, Cochin China and Japan.
The mean place of the moon in them, published in all Hindu almanacs, is found to serve unexceptionally the ends of astral vaticination.6 The system upon which it is founded is of great antiquity.
The best recognized function of German astronomers in that day was the construction of prophesying almanacs, greedily bought by a credulous public. Kepler thus found that the first duties required of him were of an astrological nature, and set himself with characteristic alacrity to master the rules of the art as laid down by Ptolemy and Cardan.
Among De Morgan's miscellaneous writings may be mentioned his Explanation of the Gnomonic Projection of the Sphere, 1836, including a description of the maps of the stars, published by the Useful Know ledge Society; his Treatise on the Globes, Celestial and Terrestrial,1845, and his remarkable [[Book]] of Almanacks (2nd edition, 1871), which contains a series of thirty-five almanacs, so arranged with indices of reference, that the almanac for any year, whether in old style or new, from any epoch, ancient or modern, up to A.
Having no clocks, they regard instead the face of the sky; the stars serve them for almanacs; they hunt and fish, they sow and reap in correspondence with the recurrent order of celestial appearances.