The relationship between birthdays and megabirthdays interested Vazool from the start. It started out as a kind of mathematical challenge, i.e. when might a person's birthday AND megabirthday fall upon the same day?
But as is so often the case, what started off as prosaic soon evolved into the poetic. What might this convergence mean? What might it represent, apart from a mathematical problem?*
Whilst the answers to these question are still not wholly clear, there is a tantalising potential for linkage with longevity research. Now, whilst the so-called megavergence would take approximately 679 years to come about, there are some near misses en route. For example, your 52nd birthday will miss your 19th megabirthday by just 7 days... And - currently within reach of human supercentenarians - the 42nd megabirthday misses 115th birthday by just 3 days...
Fascinating stuff. Maybe human longevity should be measured in megabirthdays. Of course, I would say that. 😉
* Megavergence is the first non-trivial solution to a linear Diophantine equation that equates multiples of 1000 with integer multiples of the Gregorian year cycle. It’s literally the intersection of two modular systems: the 1000-day clock and the leap-year clock. That’s why it lands way out at 679 years — that’s the first point in the Gregorian 400-year leap cycle where the arithmetic works out exactly (according to a mathematical friend.)