LYCOS RETRIEVER 
Julian Calendar: Gregorian Calendar
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Year 1917, Orthodox Churches decided to change the Julian calendar. The project was prepared by one of the greatest Serbian scientists, Milutin Milankovic (best known for providing a mathematical solution for the problem of the origin of Ice-ages which today stands as the rudiment of the currently valid theory given by the CLIMAP project). According to Milankovic�s calendar, every fourth year remains leap, but as for the secular ones, leap are only those that divided by 900 give the remainder of 200 or 600. Therefore, years 2000 and 2400 will be leap-years, but this calendar will differ from the Gregorian year 2800 when a day of difference will occur. Milankovic�s calendar is most accurate of all and is late one day just once every 48.000 years in relation to the real astronomic time.
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Mary Rowlandson was captured on February 10, 1675 according to the OS (Julian) calendar which would have been the calendar she used. Once the Gregorian calendar replaced the Julian, the date would have fallen in that January 1 through March 25 range. So subsequent historians would designate the event as happening in 1675/76.
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Before the Gregorian calendar, most countries relied on the Julian calendar, which was introduced by Julius Caesar in 45 BC. It was in common use until the 1500s. The Julian calendar creates an error of 1 day every 128 years.
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The following list contains the dates for changes from the Julian to the Gregorian calendar. However, the since the map has changed considerably in the four hundred years since the first calendar update, be aware of possible boundary changes that may have occurred.
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[W]ith the new leap year rule, 2800 will not be a leap year in the New Julian calendar, while the Gregorian year 2800 will be. The proposal leaves enough time for establishing a calendar common for all Christian churches.
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The Gregorian calendar is a modified version of the Julian calendar. The only difference being the specification of leap years. The Julian calendar specifies that every year that is a multiple of 4 will be a leap year. This leads to a year that is 365.25 days long, but the current accepted value for the tropical year is 365.242199 days.
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Gregorian Calendar