An almanack of coelestiall motions for the year of the Christian aera, 1670. [electronic resource] : Being (in our account) third after leap-year, and from the creation 5619. The vulgar notes whereof are golden number 18. Roman indiction 08. Dominicall letter B. [double bracket] Cycle of the sun 27. Epact 18. Numb. of direct. 13. Calculated for the longitude of 315 gr. and 42 gr. 30 m. north latitude. / by J.R.