## PI Day

Not exactly a holiday, but March 14 has become the penultimate math nerd’s recognition of the (approximate) ratio of the circumference of a perfect circle to it’s radius. I posted last year about approximating the value of PI in the old days using ratios resulting in not exactly PI, but close enough.

Going back even further than the hand-held electronic calculators, we did not need to figure out PI using ratios for programs, because the value of PI was engraved (along with other important math constants) right on most slide rules. You could crank out solutions to equations for radial velocity or any other esoteric calculations using PI by just using your handy-dandy “slip stick.” In those days, one could get answers calculated to three or four significant digits with just the slide rule. For more accuracy, some of us had the option of punching a deck of cards, submitting it to the Computer Lab and wait a couple of days to find out that we had an error in the program. Thank goodness there are now much better ways of dealing with numerical calculations.

In honor of PI day, the Damsel and I will be preparing today’s dinner from a low-carb recipe for “Spaghetti Pie.” The dish consists of a rich marinara sauce and some smoked chicken served in a casserole with noodles from spaghetti squash rather than pasta.

Yesterday, I loaded a couple of chicken breasts in the smoker and cooked them to their desired 165°F internal temperature. When they cooled, i shredded the meat and put it in reserve for today’s meal preparation. I may put up more about Spaghetti Pie later on by updating this post.

UPDATE: PIE ARE SQUARE! Damsel served a square of this with a green salad for dinner this afternoon. Click on the image to enlarge.

## drjim said,

March 14, 2020 @ 17:35:17

Radial velocity….aka “Omega”, or 2*Pi*f

## CapnBob said,

March 14, 2020 @ 17:47:51

That sounds like you might know your way around RF design calculations, DrJim. Been a long time since we had to do it that way though. Smith Charts and all . . .