An almanack. William Lilly, the almanack-maker and astrologer, is so called by Butler. It is said to have been the “name” of an eminent Jewish astrologer. (Halliwell: Archaic Dictionary.)
In mathematics he was greater Than Tycho Brahe or Erra Pater.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894