It’s my daughter’s birthday on October 25, which as I write, is today.
Happy birthday Heather!
I was idly thinking about my family’s birthdays while having a shower this morning (as you do), which either fall on the 25th (Heather) or the 26th (Karen, Nic and I) of some month.
I started thinking about the difference between the months of each birthday.
The difference between our son Nic’s birthday in February and my wife Karen’s in June is 4 months (6-2). So too between Karen’s and Heather’s (10-6).
The number of months between Karen’s and my birthday in November is 5 (11-6).
Completing the circle, between my birthday and Nic’s is 3 months, when moving from November to February (1 month each from Nov to Dec, Dec to Jan, Jan to Feb).
Curiously, within the same year, November back to February is 9 months (11-2), which is 32, 9 divided by 3 is 3, so 3 x 3 = 9, and so on. More simply, 12 -9 is 3. Three shows up in various ways.
The numbers 3, 4, 5 reminded me of the so-called “3, 4, 5” right-angled triangle, where two of the sides have length 3 and 4 with the diagonal (hypotenuse) having length 5.
The Pythagorean Theorem tells us that the hypotenuse is 5 because the square of the hypotenuse is the sum of the squares of the other two sides.
It amused me to note that 25 shows up here, the day in October of Heather’s birthday.
Then I figured that was enough idle math (and time) in the shower. 🙂
EDIT: also h for hypotenuse and Heather, as Karen noted after reading this.