Christmas Sunday
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Christmas Sunday is a name for 26 December when it is a Sunday.
In the United Kingdom, if Christmas Day falls on a Saturday, 26 December is correctly referred to as "Christmas Sunday", and Boxing Day moves to 27 December. However, since at least 1999 common practice has seen 26 December called "Boxing Day" even when it falls on a Sunday.
In Western Christianity, the first Sunday after Christmas is called "the First Sunday of Christmas".