ALMANACK, Nautical. This, which in some respects is a national almanack, is published under the sanction of the Board of Longitude, and is designed chiefly to facilitate the use of Mayer's Lunar Tables, by superseding the necessity of making calculations to determine the longitude at sea. It commenced with the year 1767, and has ever since been continued annually, but two or three years in advance. The late Dr Maskelyne was the originator of this very valuable publication. It is now published under the immediate superintendence of the secretary to the Board. Similar to this almanack is the French publication entitled Connaissance des Temps, directed by the Bureau de Longitude, and which commenced so early as the year 1698.