I wasn't wanting b-day wishes, although I thank you and I appreciate them...but that exercise in mathematics and astronomy was spurred by something The Woman said while we were talking about your 3 million mile accident free record.
This has nothing much to do with this discussion but I read somewhere 20 years ago...it takes, on avg, 75 years for the light from the stars that make up the Big Dipper to reach earth.
When someone turns 75 and if they happen to glance up and see the Big Dipper...you will be seeing light that left near abouts the time of your birth.
Pretty cool, I thought.