An almanack of coelestial motions for the year of the Christian epocha, 1668. : Being in our account first from leap-year, and from the creation 5617. Whose vulgar notes whereof are golden number 16 Roman indiction 06 dominical letter D [brackets] cycle of the sun 25 epact 26 number direction 01 : calculated for the longitude of 315 gr. and 42 gr. 30 m. North /