# Pi Day tomorrow!

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3/14 or March 14 is Pi Day! (In Europe, 22 July, or 22/7, is Pi Approximation Day.)

How many digits of Pi have you memorized?

I have memorized 11 digits of pi in Base-Ten: 3.1415926535. I believe that's enough precision to estimate the circumference of a sphere the size of Earth (give or take a few molecules).

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Posted (edited)
10 minutes ago, Gopi Passiflora said:

How many digits of Pi have you memorized?

None. I have a Pi do that for me.

Edited by TDD123
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3 minutes ago, TDD123 said:

None. I have a Pi do that for me.

Ah...fair enough....

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14 minutes ago, Gopi Passiflora said:

3/14 or March 14 is Pi Day! (In Europe, 22 July, or 22/7, is Pi Approximation Day.)

How many digits of Pi have you memorized?

I have memorized 11 digits of pi in Base-Ten: 3.1415926535. I believe that's enough precision to estimate the circumference of a sphere the size of Earth (give or take a few molecules).

Mmmm pi.

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Posted (edited)
17 minutes ago, Gopi Passiflora said:

3/14 or March 14 is Pi Day! (In Europe, 22 July, or 22/7, is Pi Approximation Day.)

How many digits of Pi have you memorized?

I have memorized 11 digits of pi in Base-Ten: 3.1415926535. I believe that's enough precision to estimate the circumference of a sphere the size of Earth (give or take a few molecules).

Noooooo!!!

Earth is about 40e3 KM around. That's 40e6 m and 40e9mm, or 4e10mm. You've memorized pi to eleven places, so you can estimate the circumference of a sphere the size of Earth to give or take a few tenths of a mm. Water molecules are about 275 picometers (275e-12 or 2.75e-10 meters) in diameter, so you'd need to memorize Pi to around 20 digits to get within a few molecules.

I've memorized Pi to 10 digits as well, but differ from you in the last digit.

Pi to eleven digits is 3.14159265358, so I round to 3.1415926536.

Happy Pi day, Gopi!

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Posted (edited)

Grrr, I was doing so well editing posts.

If you want to see what I changed, compare Gopi's quote to my now edited post.

;-).

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2 minutes ago, Madelaine McMasters said:

Noooooo!!!

Earth is about 40e3 KM around. That's 40e6 m and 40e9mm, or 4e10mm. You've memorized pi to eleven places, so you can estimate the circumference of a sphere the size of Earth to give or take a few tenths of a mm. Water molecules are about 275 picometers (275e-12 or 2.75e-10 meters) in diameter, so you'd need to memorize Pi to around 20 digits to get within a few molecules.

I've memorized Pi to 10 digits as well, but differ from you in the last digit.

Pi to eleven digits is 3.14159265358, so I use use 3.1415926536.

Happy Pi day, Gopi!

Ah, I see. Thanks for the info and Happy Pi Day to you, too!

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Posted (edited)
7 minutes ago, Madelaine McMasters said:

Grrr, I was doing so well editing posts.

If you want to see what I changed, compare Gopi's quote to my now edited post.

;-).

As if I'd know if anything were incorrect?

Edited by Rowan Amore
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Before: Pi to eleven digits is 3.14159265358, so I use use 3.1415926536.

After:    Pi to eleven digits is 3.14159265358, so I round to 3.1415926536.

You could tell what was incorrect. You were either too lazy, too intimidated, or too disinterested  to check, Rowan!

Plplplplplplpl!!!

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45 minutes ago, Gopi Passiflora said:

How many digits of Pi have you memorized?

The first one

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Posted (edited)
22 minutes ago, Madelaine McMasters said:

Before: Pi to eleven digits is 3.14159265358, so I use use 3.1415926536.

After:    Pi to eleven digits is 3.14159265358, so I round to 3.1415926536.

You could tell what was incorrect. You were either too lazy, too intimidated, or too disinterested  to check, Rowan!

Plplplplplplpl!!!

All of the above.  😁My eyes tend to glaze over as soon as numbers are involved.

Edited by Rowan Amore
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48 minutes ago, Gopi Passiflora said:

How many digits of Pi have you memorized?

Me:

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1 hour ago, Gopi Passiflora said:

How many digits of Pi have you memorized?

I don't need to memorize digits, I just count letters per word:

"How I wish I could recollect PI easily today, and quite properly."

3   1    4    1     5           9        2     6          5       3      5           8

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And for another odd PI factoid .... The number of seconds in a year is 60x 60 x 24 x 365 = 31,536,000  which is within less than 0.2%  of PI x 10^7.  Not a bad first approximation.

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I have always remembered PI up to 3.14159. See? I wrote that out without looking up above to Gopi's original post.

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Posted (edited)

3.1415265

Looking it up now... Oh, darn forgot the 9.

3.14159265

In the original novel Contact, by Carl Sagan, Dr. Ellie Arroway is told by the alien, who is dressed up as her father, in order to not freak her out, *spoiler alert* that the universe was made by an even more advanced civilization than theirs, that snuck its signature in the base two version of pi. Deep inside, trillions of trillions of digits down, a little image frame was encoded, of a field of zeros with ones inside, that makes a perfect pixel art circle.

Well, here's ten million digits of pi in base ten:

There's one instance in that segment of digits that's seven zeroes in sequence. It's somewhere near the 4.5 millionth digit:

Edited by Arduenn Schwartzman
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Can we just say 3.1 and call it a day?

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40 minutes ago, Arduenn Schwartzman said:

In the original novel Contact, by Carl Sagan, Dr. Ellie Arroway is told by the alien, who is dressed up as her father, in order to not freak her out, *spoiler alert* that the universe was made by an even more advanced civilization than theirs, that snuck its signature in the base two version of pi. Deep inside, trillions of trillions of digits down, a little image frame was encoded, of a field of zeros with ones inside, that makes a perfect pixel art circle.

Well, here's ten million digits of pi in base ten:

There's one instance in that segment of digits that's seven zeroes in sequence. It's somewhere near the 4.5 millionth digit:

We're living on a flat Earth.  I knew it.

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Posted (edited)

Edited by shireena1
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48 minutes ago, Garnet Psaltery said:

We're living on a flat Earth.  I knew it.

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Is there a mathematician in the room? Are there number sequences that can not appear in pi? If all number sequences can occur in there, than it's a 100% certain that pi contains the Unicode-version of the complete works of Shakespeare. (An infinite amount of them.)

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The two relevant Dad jokes I grew up with:

1) Teacher: Pi R Squared

Student: No, pi are round!

2) Grandmother: I am T-I-R-D, I've been making P-I-S all day!

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3 hours ago, Garnet Psaltery said:

We're living on a flat Earth.  I knew it.

When dealing with Flat-Earthers, I prefer to think of it as "Erf".

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3 hours ago, Arduenn Schwartzman said:

There's one instance in that segment of digits that's seven zeroes in sequence. It's somewhere near the 4.5 millionth digit:

So, is that your..slice of pie?