Calendar dating systems
January 1 was established as the first day of the new year.Protestant countries, including England and its colonies, not recognizing the authority of the Pope, continued to use the Julian Calendar.Although it may first appear that the February session was entered out of sequence, the arrangement is actually correct.Under the "Old Style" calendar and legal new year, 1636 began on March 25.
Although the "Legal" year began on March 25, the use of the Gregorian calendar by other European countries led to January 1 becoming commonly celebrated as "New Year's Day" and given as the first day of the year in almanacs.
1636" is immediately followed by a court held "21 Febr.
1636," which is followed, in turn, by "A Cort att Hartford, Mrch 28th, 1637".
The Julian Calendar was replaced by the Gregorian Calendar, changing the formula for calculating leap years.
The beginning of the legal new year was moved from March 25 to January 1.
During the Middle Ages, it began to became apparent that the Julian leap year formula had overcompensated for the actual length of a solar year, having added an extra day every 128 years. By 1582, seasonal equinoxes were falling 10 days "too early," and some church holidays, such as Easter, did not always fall in the proper seasons.