Science / Astrology / Gregorian Calendar: The calendar now used internationally, devised by Pope Gregory in the 1580s to replace the Julian calendar, which by then had accumulated a ten-day discrepancy with the solar year. Most, but not all, countries accepted the Pope's calendar by the 1700s (Great Britain, 1752). Russia did not change until 1918 and Turkey in 1928. Astrologers working with older dates should determine whether they are based on the Julian calendar, designated Old Style or OS, or on the Gregorian calendar, designated New Style or NS.
Calendar Noun Synonyms: appointment book, schedule, slate, diary, date-book, law docket
Science / Tides and Currents / Julian Calendar: A calendar introduced by Julius Caesar in the year 45 B.C., and slightly modified by Augustus a few years later. This calendar provided that the common year should consist of 365 days and that every f MORE
Entertainment / Music / Gregorian Chant: Monophonic melody with a freely flowing, unmeasured vocal line: liturgical chant of the Roman Catholic Church. Also plainchant or plainsong. MORE