The Christmas holiday lands at an essentially random date on the Bible Calendar. There are a few places in history where the date really has been on Jesus’ birthday. This article provides a date report showing the dates in question.
Because the Bible Calendar is out of phase with the Roman/Christian
calendar it is possible for certain occurrences of Christmas to land at
exactly the correct place to be an actual birthday. The following
report explores. The last time this happened on the OS calendar was
January 5, 1783. This would have been the Russian Christmas that
year. The next time it happens is January 11, 2543.
The other type of Christmas dates follows a study of the NS
calendar. The following provides the dates when this happened.
Christmas in 1784 is the last time that Christmas fell on the Biblical
anniversary of Jesus’ birthday in the English world. It doesn’t
happen again until December 25, 2591.
These reports are a wonderful demonstration of the quirks of parallel calendars. If you understand these reports and what drives their structure you probably have the calendar issues understood.