Because in fact a return to the calendar year as 365.24219 days printing costs, the Julian calendar to the year 1582 has racked up ten errors (more than ten calendar printing, or slower compared with the actual season ten days.) So Gerry Gregory XIII ordered the AD October 4, 1582 under (Julian calendar) day of the year to maintain a continuous unchanged for October 15, 1582 (Gregorian calendar) weeks. The purpose is to eliminate the accumulated error out. After modifying the law intercalation average length of the Gregorian calendar calendar Lee has reached 365.2422 days. This has been very close to the real length of the tropical year. Can be said to have a fairly accurate. Today, the Gregorian calendar in the world has been widely adopted as an international common calendar. China adopted the Gregorian calendar printed price, Tieling calendar printing, high sea Hang Fai printing provided by Foshan Nanhai Jinsha high sea Fai printing. Nanhai District of Foshan City, Hoi Fai Sands high printing (www.fs-henghui.com) strong, credible, in Foshan, Guangdong province calendar, calendars, greeting cards and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the high sea Fai printing and you hand into the brilliant, for a better future!