Gregorian calendar It also specifies its epact relative to 1 January, in contrast with the Julian calendar, which specified it relative to 22 March. The old date was derived from the Greek system: the earlier "Supputatio Romana" specified it relative to 1 January. During the period between 1582, when the first countries adopted the Gregorian calendar, and 1923, when the last European country adopted it, it was often necessary to indicate the date of some event in both the Julian calendar and in the Gregorian calendar, for example, "10/21 February 1750/51", where the dual year accounts for some countries already beginning their
Dhanu (month) (astrology). Dhanu (month) Dhanu, or Dhanus, is a month in the Hindu calendar, Malayalam calendar and others. It corresponds to the zodiacal sign of Sagittarius, and overlaps with approximately the second half of December and about the first half of January in the Gregorian calendar. In Vedic texts, the Dhanus month is called Sahas (IAST: Sahas), but in these ancient texts it has no zodiacal associations. The solar month of Dhanu overlaps with its lunar month Pausha, in Hindu lunisolar calendars. The Dhanu marks the winter season for the Indian subcontinent. It is preceded by the solar month of Vṛścik‌‌‌a,