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.
Swift, in his reply, abused him for his want of manners in giving a gentleman the lie, answered his arguments seriatim, and declared that the evidence of the publication of another almanac was wholly irrelevant, "for Gadbury, Poor Robin, Dove and Way do yearly publish their almanacs, though several of them have been dead since before the Revolution."
Nevertheless a field is found even to this day for almanacs of a similar type, and for popular belief in them.
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.
Years " of the Rat," "of the Tiger," " of the Pig," still figure in the almanacs of Central Asia, Cochin China and Japan.
Kepler, who in his youth made almanacs, and once prophesied a hard winter, which came to pass, could not help putting an astrological interpretation on the disappearance of the brilliant star of 1572, which Tycho had observed.
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.
Year-books, almanacs, directories and other annuals belong to a distinct type of publication, and are not referred to here.