For a complete concordance of the Gregorian and the republican calendars see Stokvis, Manuel d'histoire, tome iii.
Of the Printed State Papers (1834), and the Calendars of State Papers, Ireland, including that of the Carew MSS.
Moreover, it is doubtful from extant remains of Assyrian calendars whether the astrological week prevailed in civil life even among the Babylonians and Assyrians.
The Babylonian calendars contain explicit directions for the observance of abstention from certain secular acts on certain days which forms a close parallel to the Jewish Sabbatical rules.
At a printing-press established in Walther's house by Regiomontanus, Purbach's Theoricae planetarum novae was published in 1472 or 1473; a series of popular calendars issued from it, and in 1474 a volume of Ephemerides calculated by Regiomontanus for thirty-two years (1474-1506), in which the method of "lunar distances," for determining the longitude at sea, was recommended and explained.