Clavis astrologiæ, or, A key to the whole art of astrologie

in two parts: containing I. A brief, methodical, plain introduction thereunto enabling the meanest capacity fully to understand the fundamental grounds thereof and to give a rational judgment upon any astrological figure, nativity or question whatever: also how to make a proper election upon any occasion: unto which is annexed a small book of scheams ready set. II. The Genethliacal part of astrology, briefly comprehending the whole doctrine of directions, revolutions and projections; wherein is shewn by an easie and familiar method, how to rectifie and calculate nativities several ways, and according to any author, as Regiomontanus, Argol, or Kepler: also how to set a scheam the most exact way: with all requisits belonging unto the art of directions perfomed onely by a small artificial canon of sines and tangents; also many brief useful tables covenient for such work; with other varieties not here to fore published.

by Henry Coley