| Noun | 1. | New Style calendar - the solar calendar now in general use, introduced by Gregory XIII in 1582 to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752 solar calendar - a calendar based on solar cycles church calendar, ecclesiastical calendar - a calendar of the Christian year indicating the dates of fasts and festivals Gregorian calendar month - a month in the Gregorian calendar May - the month following April and preceding June June - the month following May and preceding July July - the month following June and preceding August |