An amazing coincidence for sure. In terms of calculations one must look at the total possible number of unique calendars there are. If I recall correctly it is something like 14. Logically I can figure out that there are at least 7 different calendars (each one starting with January 1 on each of the week days). There is also leap years though, that adds an extra day into each of the 7 calendars above so that makes 14 different calendars (7 “normal” calendars and 7 leap year calendars). All of the birth years for you and your family members in question must have happened on the same calendar. That is to say, that each family member was born in a year that started with the same day of the week. I have not done the calculations to actually figure this out but suspect I am in the right ball-park with my reasoning.
| Current Thread... | |
| 03/31/2015, 9:37 AM | birthdays |
| 04/13/2015, 4:05 PM | Re: birthdays |
| 04/14/2015, 3:27 PM | Re: birthdays |