Julian Calendar vs. Gregorian Calendar

Sooner or later, anyone doing in-depth genealogy research will come upon dates with a double year (i.e. 1634/5). During a Couch search in Google, I came upon a website under the heading "Researching the Andrews / Andrus heritage". This researcher did such a wonderful job of explaining the reasoning behind the double date that it bears sending you to his/her site listed below (information near the bottom of the page - starting with "Note, the double year designation is due to the 1742 change in calendar from Julian to Gregorian...").

From this same website, the following entries should be noted - not only because of the Couch name but also for clues in where to search for the Couch family in England:

Francis Andrews (~1600 England-6/6/1662 Fairfield,CT) married Anna Smith (~1620-?) in ~1640 in Hartford,CT -- 10 children

One of the children, Mary, married Simon Couch - possibly a brother to our Thomas?

Mary Andrews (~1645 Hartford, CT/ 5 July 1687 Fairfield, CT) married Simon Couch (1633 Devonshire England/Norwalk, CT) in 1664

Source:
http://haygenealogy.com/hay/sources/gregory/andrews-tree.html